用来用去，还是这个好用

// ===============================================================================// Microsoft Data Access Application Block for .NET// http://msdn.microsoft.com/library/en-us/dnbda/html/daab-rm.asp//// SQLHelper.cs//// This file contains the implementations of the SqlHelper and SqlHelperParameterCache// classes.//// For more information see the Data Access Application Block Implementation Overview. // ===============================================================================// Release history// VERSION    DESCRIPTION//   2.0    Added support for FillDataset, UpdateDataset and "Param" helper methods//// ===============================================================================// Copyright (C) 2000-2001 Microsoft Corporation// All rights reserved.// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT// LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR// FITNESS FOR A PARTICULAR PURPOSE.// ==============================================================================using System;using System.Data;using System.Xml;using System.Data.SqlClient;using System.Collections;namespace F.Studio.Data.Util{    /// 
    /// The SqlHelper class is intended to encapsulate high performance, scalable best practices for     /// common uses of SqlClient    /// 
    public sealed class SqlHelper    {        #region private utility methods & constructors        // Since this class provides only static methods, make the default constructor private to prevent         // instances from being created with "new SqlHelper()"        private SqlHelper() {}        /// 
        /// This method is used to attach array of SqlParameters to a SqlCommand.        ///         /// This method will assign a value of DbNull to any parameter with a direction of        /// InputOutput and a value of null.          ///         /// This behavior will prevent default values from being used, but        /// this will be the less common case than an intended pure output parameter (derived as InputOutput)        /// where the user provided no input value.        /// 
        /// The command to which the parameters will be added        /// An array of SqlParameters to be added to command        private static void AttachParameters(SqlCommand command, SqlParameter[] commandParameters)        {            if( command == null ) throw new ArgumentNullException( "command" );            if( commandParameters != null )            {                foreach (SqlParameter p in commandParameters)                {                    if( p != null )                    {                        // Check for derived output value with no value assigned                        if ( ( p.Direction == ParameterDirection.InputOutput ||                             p.Direction == ParameterDirection.Input ) &&                             (p.Value == null))                        {                            p.Value = DBNull.Value;                        }                        command.Parameters.Add(p);                    }                }            }        }        /// 
        /// This method assigns dataRow column values to an array of SqlParameters        /// 
        /// Array of SqlParameters to be assigned values        /// The dataRow used to hold the stored procedure's parameter values        private static void AssignParameterValues(SqlParameter[] commandParameters, DataRow dataRow)        {            if ((commandParameters == null) || (dataRow == null))             {                // Do nothing if we get no data                return;            }            int i = 0;            // Set the parameters values            foreach(SqlParameter commandParameter in commandParameters)            {                // Check the parameter name                if( commandParameter.ParameterName == null ||                     commandParameter.ParameterName.Length <= 1 )                    throw new Exception(                         string.Format(                             "Please provide a valid parameter name on the parameter #{0}, the ParameterName property has the following value: '{1}'.",                             i, commandParameter.ParameterName ) );                if (dataRow.Table.Columns.IndexOf(commandParameter.ParameterName.Substring(1)) != -1)                    commandParameter.Value = dataRow[commandParameter.ParameterName.Substring(1)];                i++;            }        }        /// 
        /// This method assigns an array of values to an array of SqlParameters        /// 
        /// Array of SqlParameters to be assigned values        /// Array of objects holding the values to be assigned        private static void AssignParameterValues(SqlParameter[] commandParameters, object[] parameterValues)        {            if ((commandParameters == null) || (parameterValues == null))             {                // Do nothing if we get no data                return;            }            // We must have the same number of values as we pave parameters to put them in            if (commandParameters.Length != parameterValues.Length)            {                throw new ArgumentException("Parameter count does not match Parameter Value count.");            }            // Iterate through the SqlParameters, assigning the values from the corresponding position in the             // value array            for (int i = 0, j = commandParameters.Length; i < j; i++)            {                // If the current array value derives from IDbDataParameter, then assign its Value property                if (parameterValues[i] is IDbDataParameter)                {                    IDbDataParameter paramInstance = (IDbDataParameter)parameterValues[i];                    if( paramInstance.Value == null )                    {                        commandParameters[i].Value = DBNull.Value;                     }                    else                    {                        commandParameters[i].Value = paramInstance.Value;                    }                }                else if (parameterValues[i] == null)                {                    commandParameters[i].Value = DBNull.Value;                }                else                {                    commandParameters[i].Value = parameterValues[i];                }            }        }        /// 
        /// This method opens (if necessary) and assigns a connection, transaction, command type and parameters         /// to the provided command        /// 
        /// The SqlCommand to be prepared        /// A valid SqlConnection, on which to execute this command        /// A valid SqlTransaction, or 'null'        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParameters to be associated with the command or 'null' if no parameters are required        /// 
      
       true
       if the connection was opened by the method, otherwose is false.        private static void PrepareCommand(SqlCommand command, SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, out bool mustCloseConnection )        {            if( command == null ) throw new ArgumentNullException( "command" );            if( commandText == null || commandText.Length == 0 ) throw new ArgumentNullException( "commandText" );            // If the provided connection is not open, we will open it            if (connection.State != ConnectionState.Open)            {                mustCloseConnection = true;                connection.Open();            }            else            {                mustCloseConnection = false;            }            // Associate the connection with the command            command.Connection = connection;            // Set the command text (stored procedure name or SQL statement)            command.CommandText = commandText;            // If we were provided a transaction, assign it            if (transaction != null)            {                if( transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );                command.Transaction = transaction;            }            // Set the command type            command.CommandType = commandType;            // Attach the command parameters if they are provided            if (commandParameters != null)            {                AttachParameters(command, commandParameters);            }            return;        }        #endregion private utility methods & constructors        #region ExecuteNonQuery        /// 
        /// Execute a SqlCommand (that returns no resultset and takes no parameters) against the database specified in         /// the connection string        /// 
        /// 
      
               /// e.g.:          ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders");        /// 
              /// A valid connection string for a SqlConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// 
      
       An int representing the number of rows affected by the command
              public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText)        {            // Pass through the call providing null for the set of SqlParameters            return ExecuteNonQuery(connectionString, commandType, commandText, (SqlParameter[])null);        }        /// 
        /// Execute a SqlCommand (that returns no resultset) against the database specified in the connection string         /// using the provided parameters        /// 
        /// 
      
               /// e.g.:          ///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));        /// 
              /// A valid connection string for a SqlConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParamters used to execute the command        /// 
      
       An int representing the number of rows affected by the command
              public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)        {            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );            // Create & open a SqlConnection, and dispose of it after we are done            using (SqlConnection connection = new SqlConnection(connectionString))            {                connection.Open();                // Call the overload that takes a connection in place of the connection string                return ExecuteNonQuery(connection, commandType, commandText, commandParameters);            }        }        /// 
        /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the database specified in         /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.        /// 
        /// 
      
               /// This method provides no access to output parameters or the stored procedure's return value parameter.        ///         /// e.g.:          ///  int result = ExecuteNonQuery(connString, "PublishOrders", 24, 36);        /// 
              /// A valid connection string for a SqlConnection        /// The name of the stored prcedure        /// An array of objects to be assigned as the input values of the stored procedure        /// 
      
       An int representing the number of rows affected by the command
              public static int ExecuteNonQuery(string connectionString, string spName, params object[] parameterValues)        {            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );            // If we receive parameter values, we need to figure out where they go            if ((parameterValues != null) && (parameterValues.Length > 0))             {                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);                // Assign the provided values to these parameters based on parameter order                AssignParameterValues(commandParameters, parameterValues);                // Call the overload that takes an array of SqlParameters                return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);            }            else             {                // Otherwise we can just call the SP without params                return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);            }        }        /// 
        /// Execute a SqlCommand (that returns no resultset and takes no parameters) against the provided SqlConnection.         /// 
        /// 
      
               /// e.g.:          ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders");        /// 
              /// A valid SqlConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// 
      
       An int representing the number of rows affected by the command
              public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText)        {            // Pass through the call providing null for the set of SqlParameters            return ExecuteNonQuery(connection, commandType, commandText, (SqlParameter[])null);        }        /// 
        /// Execute a SqlCommand (that returns no resultset) against the specified SqlConnection         /// using the provided parameters.        /// 
        /// 
      
               /// e.g.:          ///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));        /// 
              /// A valid SqlConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParamters used to execute the command        /// 
      
       An int representing the number of rows affected by the command
              public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)        {                if( connection == null ) throw new ArgumentNullException( "connection" );            // Create a command and prepare it for execution            SqlCommand cmd = new SqlCommand();            bool mustCloseConnection = false;            PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection );                        // Finally, execute the command            int retval = cmd.ExecuteNonQuery();                        // Detach the SqlParameters from the command object, so they can be used again            cmd.Parameters.Clear();            if( mustCloseConnection )                connection.Close();            return retval;        }        /// 
        /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified SqlConnection         /// using the provided parameter values.  This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.        /// 
        /// 
      
               /// This method provides no access to output parameters or the stored procedure's return value parameter.        ///         /// e.g.:          ///  int result = ExecuteNonQuery(conn, "PublishOrders", 24, 36);        /// 
              /// A valid SqlConnection        /// The name of the stored procedure        /// An array of objects to be assigned as the input values of the stored procedure        /// 
      
       An int representing the number of rows affected by the command
              public static int ExecuteNonQuery(SqlConnection connection, string spName, params object[] parameterValues)        {            if( connection == null ) throw new ArgumentNullException( "connection" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );            // If we receive parameter values, we need to figure out where they go            if ((parameterValues != null) && (parameterValues.Length > 0))             {                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);                // Assign the provided values to these parameters based on parameter order                AssignParameterValues(commandParameters, parameterValues);                // Call the overload that takes an array of SqlParameters                return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);            }            else             {                // Otherwise we can just call the SP without params                return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);            }        }        /// 
        /// Execute a SqlCommand (that returns no resultset and takes no parameters) against the provided SqlTransaction.         /// 
        /// 
      
               /// e.g.:          ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders");        /// 
              /// A valid SqlTransaction        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// 
      
       An int representing the number of rows affected by the command
              public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText)        {            // Pass through the call providing null for the set of SqlParameters            return ExecuteNonQuery(transaction, commandType, commandText, (SqlParameter[])null);        }        /// 
        /// Execute a SqlCommand (that returns no resultset) against the specified SqlTransaction        /// using the provided parameters.        /// 
        /// 
      
               /// e.g.:          ///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));        /// 
              /// A valid SqlTransaction        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParamters used to execute the command        /// 
      
       An int representing the number of rows affected by the command
              public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)        {            if( transaction == null ) throw new ArgumentNullException( "transaction" );            if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );            // Create a command and prepare it for execution            SqlCommand cmd = new SqlCommand();            bool mustCloseConnection = false;            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );                            // Finally, execute the command            int retval = cmd.ExecuteNonQuery();                            // Detach the SqlParameters from the command object, so they can be used again            cmd.Parameters.Clear();            return retval;        }        /// 
        /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified         /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.        /// 
        /// 
      
               /// This method provides no access to output parameters or the stored procedure's return value parameter.        ///         /// e.g.:          ///  int result = ExecuteNonQuery(conn, trans, "PublishOrders", 24, 36);        /// 
              /// A valid SqlTransaction        /// The name of the stored procedure        /// An array of objects to be assigned as the input values of the stored procedure        /// 
      
       An int representing the number of rows affected by the command
              public static int ExecuteNonQuery(SqlTransaction transaction, string spName, params object[] parameterValues)        {            if( transaction == null ) throw new ArgumentNullException( "transaction" );            if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );            // If we receive parameter values, we need to figure out where they go            if ((parameterValues != null) && (parameterValues.Length > 0))             {                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);                // Assign the provided values to these parameters based on parameter order                AssignParameterValues(commandParameters, parameterValues);                // Call the overload that takes an array of SqlParameters                return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);            }            else             {                // Otherwise we can just call the SP without params                return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);            }        }        #endregion ExecuteNonQuery        #region ExecuteDataset        /// 
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in         /// the connection string.         /// 
        /// 
      
               /// e.g.:          ///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders");        /// 
              /// A valid connection string for a SqlConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// 
      
       A dataset containing the resultset generated by the command
              public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText)        {            // Pass through the call providing null for the set of SqlParameters            return ExecuteDataset(connectionString, commandType, commandText, (SqlParameter[])null);        }        /// 
        /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string         /// using the provided parameters.        /// 
        /// 
      
               /// e.g.:          ///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));        /// 
              /// A valid connection string for a SqlConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParamters used to execute the command        /// 
      
       A dataset containing the resultset generated by the command
              public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)        {            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );            // Create & open a SqlConnection, and dispose of it after we are done            using (SqlConnection connection = new SqlConnection(connectionString))            {                connection.Open();                // Call the overload that takes a connection in place of the connection string                return ExecuteDataset(connection, commandType, commandText, commandParameters);            }        }        /// 
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in         /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.        /// 
        /// 
      
               /// This method provides no access to output parameters or the stored procedure's return value parameter.        ///         /// e.g.:          ///  DataSet ds = ExecuteDataset(connString, "GetOrders", 24, 36);        /// 
              /// A valid connection string for a SqlConnection        /// The name of the stored procedure        /// An array of objects to be assigned as the input values of the stored procedure        /// 
      
       A dataset containing the resultset generated by the command
              public static DataSet ExecuteDataset(string connectionString, string spName, params object[] parameterValues)        {            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );                        // If we receive parameter values, we need to figure out where they go            if ((parameterValues != null) && (parameterValues.Length > 0))             {                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);                // Assign the provided values to these parameters based on parameter order                AssignParameterValues(commandParameters, parameterValues);                // Call the overload that takes an array of SqlParameters                return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);            }            else             {                // Otherwise we can just call the SP without params                return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);            }        }        /// 
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection.         /// 
        /// 
      
               /// e.g.:          ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders");        /// 
              /// A valid SqlConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// 
      
       A dataset containing the resultset generated by the command
              public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText)        {            // Pass through the call providing null for the set of SqlParameters            return ExecuteDataset(connection, commandType, commandText, (SqlParameter[])null);        }                /// 
        /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection         /// using the provided parameters.        /// 
        /// 
      
               /// e.g.:          ///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));        /// 
              /// A valid SqlConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParamters used to execute the command        /// 
      
       A dataset containing the resultset generated by the command
              public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)        {            if( connection == null ) throw new ArgumentNullException( "connection" );            // Create a command and prepare it for execution            SqlCommand cmd = new SqlCommand();            bool mustCloseConnection = false;            PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection );                            // Create the DataAdapter & DataSet            using( SqlDataAdapter da = new SqlDataAdapter(cmd) )            {                DataSet ds = new DataSet();                // Fill the DataSet using default values for DataTable names, etc                da.Fill(ds);                                // Detach the SqlParameters from the command object, so they can be used again                cmd.Parameters.Clear();                if( mustCloseConnection )                    connection.Close();                // Return the dataset                return ds;            }            }                /// 
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection         /// using the provided parameter values.  This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.        /// 
        /// 
      
               /// This method provides no access to output parameters or the stored procedure's return value parameter.        ///         /// e.g.:          ///  DataSet ds = ExecuteDataset(conn, "GetOrders", 24, 36);        /// 
              /// A valid SqlConnection        /// The name of the stored procedure        /// An array of objects to be assigned as the input values of the stored procedure        /// 
      
       A dataset containing the resultset generated by the command
              public static DataSet ExecuteDataset(SqlConnection connection, string spName, params object[] parameterValues)        {            if( connection == null ) throw new ArgumentNullException( "connection" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );            // If we receive parameter values, we need to figure out where they go            if ((parameterValues != null) && (parameterValues.Length > 0))             {                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);                // Assign the provided values to these parameters based on parameter order                AssignParameterValues(commandParameters, parameterValues);                // Call the overload that takes an array of SqlParameters                return ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);            }            else             {                // Otherwise we can just call the SP without params                return ExecuteDataset(connection, CommandType.StoredProcedure, spName);            }        }        /// 
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction.         /// 
        /// 
      
               /// e.g.:          ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders");        /// 
              /// A valid SqlTransaction        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// 
      
       A dataset containing the resultset generated by the command
              public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText)        {            // Pass through the call providing null for the set of SqlParameters            return ExecuteDataset(transaction, commandType, commandText, (SqlParameter[])null);        }                /// 
        /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction        /// using the provided parameters.        /// 
        /// 
      
               /// e.g.:          ///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));        /// 
              /// A valid SqlTransaction        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParamters used to execute the command        /// 
      
       A dataset containing the resultset generated by the command
              public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)        {            if( transaction == null ) throw new ArgumentNullException( "transaction" );            if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );            // Create a command and prepare it for execution            SqlCommand cmd = new SqlCommand();            bool mustCloseConnection = false;            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );                            // Create the DataAdapter & DataSet            using( SqlDataAdapter da = new SqlDataAdapter(cmd) )            {                DataSet ds = new DataSet();                // Fill the DataSet using default values for DataTable names, etc                da.Fill(ds);                                // Detach the SqlParameters from the command object, so they can be used again                cmd.Parameters.Clear();                // Return the dataset                return ds;            }            }                /// 
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified         /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.        /// 
        /// 
      
               /// This method provides no access to output parameters or the stored procedure's return value parameter.        ///         /// e.g.:          ///  DataSet ds = ExecuteDataset(trans, "GetOrders", 24, 36);        /// 
              /// A valid SqlTransaction        /// The name of the stored procedure        /// An array of objects to be assigned as the input values of the stored procedure        /// 
      
       A dataset containing the resultset generated by the command
              public static DataSet ExecuteDataset(SqlTransaction transaction, string spName, params object[] parameterValues)        {            if( transaction == null ) throw new ArgumentNullException( "transaction" );            if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );                        // If we receive parameter values, we need to figure out where they go            if ((parameterValues != null) && (parameterValues.Length > 0))             {                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);                // Assign the provided values to these parameters based on parameter order                AssignParameterValues(commandParameters, parameterValues);                // Call the overload that takes an array of SqlParameters                return ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);            }            else             {                // Otherwise we can just call the SP without params                return ExecuteDataset(transaction, CommandType.StoredProcedure, spName);            }        }        #endregion ExecuteDataset                #region ExecuteReader        /// 
        /// This enum is used to indicate whether the connection was provided by the caller, or created by SqlHelper, so that        /// we can set the appropriate CommandBehavior when calling ExecuteReader()        /// 
        private enum SqlConnectionOwnership            {            /// 
Connection is owned and managed by SqlHelper
            Internal,             /// 
Connection is owned and managed by the caller
            External        }        /// 
        /// Create and prepare a SqlCommand, and call ExecuteReader with the appropriate CommandBehavior.        /// 
        /// 
      
               /// If we created and opened the connection, we want the connection to be closed when the DataReader is closed.        ///         /// If the caller provided the connection, we want to leave it to them to manage.        /// 
              /// A valid SqlConnection, on which to execute this command        /// A valid SqlTransaction, or 'null'        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParameters to be associated with the command or 'null' if no parameters are required        /// Indicates whether the connection parameter was provided by the caller, or created by SqlHelper        /// 
      
       SqlDataReader containing the results of the command
              private static SqlDataReader ExecuteReader(SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, SqlConnectionOwnership connectionOwnership)        {                if( connection == null ) throw new ArgumentNullException( "connection" );            bool mustCloseConnection = false;            // Create a command and prepare it for execution            SqlCommand cmd = new SqlCommand();            try            {                PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );                            // Create a reader                SqlDataReader dataReader;                // Call ExecuteReader with the appropriate CommandBehavior                if (connectionOwnership == SqlConnectionOwnership.External)                {                    dataReader = cmd.ExecuteReader();                }                else                {                    dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);                }                            // Detach the SqlParameters from the command object, so they can be used again.                // HACK: There is a problem here, the output parameter values are fletched                 // when the reader is closed, so if the parameters are detached from the command                // then the SqlReader can磘 set its values.                 // When this happen, the parameters can磘 be used again in other command.                bool canClear = true;                foreach(SqlParameter commandParameter in cmd.Parameters)                {                    if (commandParameter.Direction != ParameterDirection.Input)                        canClear = false;                }                            if (canClear)                {                    cmd.Parameters.Clear();                }                return dataReader;            }            catch            {                if( mustCloseConnection )                    connection.Close();                throw;            }        }        /// 
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in         /// the connection string.         /// 
        /// 
      
               /// e.g.:          ///  SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders");        /// 
              /// A valid connection string for a SqlConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// 
      
       A SqlDataReader containing the resultset generated by the command
              public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText)        {            // Pass through the call providing null for the set of SqlParameters            return ExecuteReader(connectionString, commandType, commandText, (SqlParameter[])null);        }        /// 
        /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string         /// using the provided parameters.        /// 
        /// 
      
               /// e.g.:          ///  SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));        /// 
              /// A valid connection string for a SqlConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParamters used to execute the command        /// 
      
       A SqlDataReader containing the resultset generated by the command
              public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)        {            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );            SqlConnection connection = null;            try            {                connection = new SqlConnection(connectionString);                connection.Open();                // Call the private overload that takes an internally owned connection in place of the connection string                return ExecuteReader(connection, null, commandType, commandText, commandParameters,SqlConnectionOwnership.Internal);            }            catch            {                // If we fail to return the SqlDatReader, we need to close the connection ourselves                if( connection != null ) connection.Close();                throw;            }                    }        /// 
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in         /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.        /// 
        /// 
      
               /// This method provides no access to output parameters or the stored procedure's return value parameter.        ///         /// e.g.:          ///  SqlDataReader dr = ExecuteReader(connString, "GetOrders", 24, 36);        /// 
              /// A valid connection string for a SqlConnection        /// The name of the stored procedure        /// An array of objects to be assigned as the input values of the stored procedure        /// 
      
       A SqlDataReader containing the resultset generated by the command
              public static SqlDataReader ExecuteReader(string connectionString, string spName, params object[] parameterValues)        {            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );                        // If we receive parameter values, we need to figure out where they go            if ((parameterValues != null) && (parameterValues.Length > 0))             {                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);                AssignParameterValues(commandParameters, parameterValues);                return ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);            }            else             {                // Otherwise we can just call the SP without params                return ExecuteReader(connectionString, CommandType.StoredProcedure, spName);            }        }        /// 
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection.         /// 
        /// 
      
               /// e.g.:          ///  SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders");        /// 
              /// A valid SqlConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// 
      
       A SqlDataReader containing the resultset generated by the command
              public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText)        {            // Pass through the call providing null for the set of SqlParameters            return ExecuteReader(connection, commandType, commandText, (SqlParameter[])null);        }        /// 
        /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection         /// using the provided parameters.        /// 
        /// 
      
               /// e.g.:          ///  SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));        /// 
              /// A valid SqlConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParamters used to execute the command        /// 
      
       A SqlDataReader containing the resultset generated by the command
              public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)        {            // Pass through the call to the private overload using a null transaction value and an externally owned connection            return ExecuteReader(connection, (SqlTransaction)null, commandType, commandText, commandParameters, SqlConnectionOwnership.External);        }        /// 
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection         /// using the provided parameter values.  This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.        /// 
        /// 
      
               /// This method provides no access to output parameters or the stored procedure's return value parameter.        ///         /// e.g.:          ///  SqlDataReader dr = ExecuteReader(conn, "GetOrders", 24, 36);        /// 
              /// A valid SqlConnection        /// The name of the stored procedure        /// An array of objects to be assigned as the input values of the stored procedure        /// 
      
       A SqlDataReader containing the resultset generated by the command
              public static SqlDataReader ExecuteReader(SqlConnection connection, string spName, params object[] parameterValues)        {            if( connection == null ) throw new ArgumentNullException( "connection" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );            // If we receive parameter values, we need to figure out where they go            if ((parameterValues != null) && (parameterValues.Length > 0))             {                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);                AssignParameterValues(commandParameters, parameterValues);                return ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);            }            else             {                // Otherwise we can just call the SP without params                return ExecuteReader(connection, CommandType.StoredProcedure, spName);            }        }        /// 
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction.         /// 
        /// 
      
               /// e.g.:          ///  SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders");        /// 
              /// A valid SqlTransaction        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// 
      
       A SqlDataReader containing the resultset generated by the command
              public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText)        {            // Pass through the call providing null for the set of SqlParameters            return ExecuteReader(transaction, commandType, commandText, (SqlParameter[])null);        }        /// 
        /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction        /// using the provided parameters.        /// 
        /// 
      
               /// e.g.:          ///   SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));        /// 
              /// A valid SqlTransaction        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParamters used to execute the command        /// 
      
       A SqlDataReader containing the resultset generated by the command
              public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)        {            if( transaction == null ) throw new ArgumentNullException( "transaction" );            if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );            // Pass through to private overload, indicating that the connection is owned by the caller            return ExecuteReader(transaction.Connection, transaction, commandType, commandText, commandParameters, SqlConnectionOwnership.External);        }        /// 
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified        /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.        /// 
        /// 
      
               /// This method provides no access to output parameters or the stored procedure's return value parameter.        ///         /// e.g.:          ///  SqlDataReader dr = ExecuteReader(trans, "GetOrders", 24, 36);        /// 
              /// A valid SqlTransaction        /// The name of the stored procedure        /// An array of objects to be assigned as the input values of the stored procedure        /// 
      
       A SqlDataReader containing the resultset generated by the command
              public static SqlDataReader ExecuteReader(SqlTransaction transaction, string spName, params object[] parameterValues)        {            if( transaction == null ) throw new ArgumentNullException( "transaction" );            if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );            // If we receive parameter values, we need to figure out where they go            if ((parameterValues != null) && (parameterValues.Length > 0))             {                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);                AssignParameterValues(commandParameters, parameterValues);                return ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);            }            else             {                // Otherwise we can just call the SP without params                return ExecuteReader(transaction, CommandType.StoredProcedure, spName);            }        }        #endregion ExecuteReader        #region ExecuteScalar                /// 
        /// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the database specified in         /// the connection string.         /// 
        /// 
      
               /// e.g.:          ///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount");        /// 
              /// A valid connection string for a SqlConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// 
      
       An object containing the value in the 1x1 resultset generated by the command
              public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText)        {            // Pass through the call providing null for the set of SqlParameters            return ExecuteScalar(connectionString, commandType, commandText, (SqlParameter[])null);        }        /// 
        /// Execute a SqlCommand (that returns a 1x1 resultset) against the database specified in the connection string         /// using the provided parameters.        /// 
        /// 
      
               /// e.g.:          ///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));        /// 
              /// A valid connection string for a SqlConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParamters used to execute the command        /// 
      
       An object containing the value in the 1x1 resultset generated by the command
              public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)        {            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );            // Create & open a SqlConnection, and dispose of it after we are done            using (SqlConnection connection = new SqlConnection(connectionString))            {                connection.Open();                // Call the overload that takes a connection in place of the connection string                return ExecuteScalar(connection, commandType, commandText, commandParameters);            }        }        /// 
        /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the database specified in         /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.        /// 
        /// 
      
               /// This method provides no access to output parameters or the stored procedure's return value parameter.        ///         /// e.g.:          ///  int orderCount = (int)ExecuteScalar(connString, "GetOrderCount", 24, 36);        /// 
              /// A valid connection string for a SqlConnection        /// The name of the stored procedure        /// An array of objects to be assigned as the input values of the stored procedure        /// 
      
       An object containing the value in the 1x1 resultset generated by the command
              public static object ExecuteScalar(string connectionString, string spName, params object[] parameterValues)        {            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );                        // If we receive parameter values, we need to figure out where they go            if ((parameterValues != null) && (parameterValues.Length > 0))             {                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);                // Assign the provided values to these parameters based on parameter order                AssignParameterValues(commandParameters, parameterValues);                // Call the overload that takes an array of SqlParameters                return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);            }            else             {                // Otherwise we can just call the SP without params                return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);            }        }        /// 
        /// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the provided SqlConnection.         /// 
        /// 
      
               /// e.g.:          ///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount");        /// 
              /// A valid SqlConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// 
      
       An object containing the value in the 1x1 resultset generated by the command
              public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText)        {            // Pass through the call providing null for the set of SqlParameters            return ExecuteScalar(connection, commandType, commandText, (SqlParameter[])null);        }        /// 
        /// Execute a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection         /// using the provided parameters.        /// 
        /// 
      
               /// e.g.:          ///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));        /// 
              /// A valid SqlConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParamters used to execute the command        /// 
      
       An object containing the value in the 1x1 resultset generated by the command
              public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)        {            if( connection == null ) throw new ArgumentNullException( "connection" );            // Create a command and prepare it for execution            SqlCommand cmd = new SqlCommand();            bool mustCloseConnection = false;            PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection );                            // Execute the command & return the results            object retval = cmd.ExecuteScalar();                            // Detach the SqlParameters from the command object, so they can be used again            cmd.Parameters.Clear();            if( mustCloseConnection )                connection.Close();            return retval;        }        /// 
        /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection         /// using the provided parameter values.  This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.        /// 
        /// 
      
               /// This method provides no access to output parameters or the stored procedure's return value parameter.        ///         /// e.g.:          ///  int orderCount = (int)ExecuteScalar(conn, "GetOrderCount", 24, 36);        /// 
              /// A valid SqlConnection        /// The name of the stored procedure        /// An array of objects to be assigned as the input values of the stored procedure        /// 
      
       An object containing the value in the 1x1 resultset generated by the command
              public static object ExecuteScalar(SqlConnection connection, string spName, params object[] parameterValues)        {            if( connection == null ) throw new ArgumentNullException( "connection" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );            // If we receive parameter values, we need to figure out where they go            if ((parameterValues != null) && (parameterValues.Length > 0))             {                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);                // Assign the provided values to these parameters based on parameter order                AssignParameterValues(commandParameters, parameterValues);                // Call the overload that takes an array of SqlParameters                return ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);            }            else             {                // Otherwise we can just call the SP without params                return ExecuteScalar(connection, CommandType.StoredProcedure, spName);            }        }        /// 
        /// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the provided SqlTransaction.         /// 
        /// 
      
               /// e.g.:          ///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount");        /// 
              /// A valid SqlTransaction        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// 
      
       An object containing the value in the 1x1 resultset generated by the command
              public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText)        {            // Pass through the call providing null for the set of SqlParameters            return ExecuteScalar(transaction, commandType, commandText, (SqlParameter[])null);        }        /// 
        /// Execute a SqlCommand (that returns a 1x1 resultset) against the specified SqlTransaction        /// using the provided parameters.        /// 
        /// 
      
               /// e.g.:          ///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));        /// 
              /// A valid SqlTransaction        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParamters used to execute the command        /// 
      
       An object containing the value in the 1x1 resultset generated by the command
              public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)        {            if( transaction == null ) throw new ArgumentNullException( "transaction" );            if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );            // Create a command and prepare it for execution            SqlCommand cmd = new SqlCommand();            bool mustCloseConnection = false;            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );                            // Execute the command & return the results            object retval = cmd.ExecuteScalar();                            // Detach the SqlParameters from the command object, so they can be used again            cmd.Parameters.Clear();            return retval;        }        /// 
        /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified        /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.        /// 
        /// 
      
               /// This method provides no access to output parameters or the stored procedure's return value parameter.        ///         /// e.g.:          ///  int orderCount = (int)ExecuteScalar(trans, "GetOrderCount", 24, 36);        /// 
              /// A valid SqlTransaction        /// The name of the stored procedure        /// An array of objects to be assigned as the input values of the stored procedure        /// 
      
       An object containing the value in the 1x1 resultset generated by the command
              public static object ExecuteScalar(SqlTransaction transaction, string spName, params object[] parameterValues)        {            if( transaction == null ) throw new ArgumentNullException( "transaction" );            if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );            // If we receive parameter values, we need to figure out where they go            if ((parameterValues != null) && (parameterValues.Length > 0))             {                // PPull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);                // Assign the provided values to these parameters based on parameter order                AssignParameterValues(commandParameters, parameterValues);                // Call the overload that takes an array of SqlParameters                return ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);            }            else             {                // Otherwise we can just call the SP without params                return ExecuteScalar(transaction, CommandType.StoredProcedure, spName);            }        }        #endregion ExecuteScalar            #region ExecuteXmlReader        /// 
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection.         /// 
        /// 
      
               /// e.g.:          ///  XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders");        /// 
              /// A valid SqlConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command using "FOR XML AUTO"        /// 
      
       An XmlReader containing the resultset generated by the command
              public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText)        {            // Pass through the call providing null for the set of SqlParameters            return ExecuteXmlReader(connection, commandType, commandText, (SqlParameter[])null);        }        /// 
        /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection         /// using the provided parameters.        /// 
        /// 
      
               /// e.g.:          ///  XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));        /// 
              /// A valid SqlConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command using "FOR XML AUTO"        /// An array of SqlParamters used to execute the command        /// 
      
       An XmlReader containing the resultset generated by the command
              public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)        {            if( connection == null ) throw new ArgumentNullException( "connection" );            bool mustCloseConnection = false;            // Create a command and prepare it for execution            SqlCommand cmd = new SqlCommand();            try            {                PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters, out mustCloseConnection );                            // Create the DataAdapter & DataSet                XmlReader retval = cmd.ExecuteXmlReader();                            // Detach the SqlParameters from the command object, so they can be used again                cmd.Parameters.Clear();                return retval;            }            catch            {                    if( mustCloseConnection )                    connection.Close();                throw;            }        }        /// 
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection         /// using the provided parameter values.  This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.        /// 
        /// 
      
               /// This method provides no access to output parameters or the stored procedure's return value parameter.        ///         /// e.g.:          ///  XmlReader r = ExecuteXmlReader(conn, "GetOrders", 24, 36);        /// 
              /// A valid SqlConnection        /// The name of the stored procedure using "FOR XML AUTO"        /// An array of objects to be assigned as the input values of the stored procedure        /// 
      
       An XmlReader containing the resultset generated by the command
              public static XmlReader ExecuteXmlReader(SqlConnection connection, string spName, params object[] parameterValues)        {            if( connection == null ) throw new ArgumentNullException( "connection" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );            // If we receive parameter values, we need to figure out where they go            if ((parameterValues != null) && (parameterValues.Length > 0))             {                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);                // Assign the provided values to these parameters based on parameter order                AssignParameterValues(commandParameters, parameterValues);                // Call the overload that takes an array of SqlParameters                return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);            }            else             {                // Otherwise we can just call the SP without params                return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);            }        }        /// 
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction.         /// 
        /// 
      
               /// e.g.:          ///  XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders");        /// 
              /// A valid SqlTransaction        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command using "FOR XML AUTO"        /// 
      
       An XmlReader containing the resultset generated by the command
              public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText)        {            // Pass through the call providing null for the set of SqlParameters            return ExecuteXmlReader(transaction, commandType, commandText, (SqlParameter[])null);        }        /// 
        /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction        /// using the provided parameters.        /// 
        /// 
      
               /// e.g.:          ///  XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));        /// 
              /// A valid SqlTransaction        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command using "FOR XML AUTO"        /// An array of SqlParamters used to execute the command        /// 
      
       An XmlReader containing the resultset generated by the command
              public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)        {            if( transaction == null ) throw new ArgumentNullException( "transaction" );            if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );            // Create a command and prepare it for execution            SqlCommand cmd = new SqlCommand();            bool mustCloseConnection = false;            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );                        // Create the DataAdapter & DataSet            XmlReader retval = cmd.ExecuteXmlReader();                        // Detach the SqlParameters from the command object, so they can be used again            cmd.Parameters.Clear();            return retval;                    }        /// 
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified         /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.        /// 
        /// 
      
               /// This method provides no access to output parameters or the stored procedure's return value parameter.        ///         /// e.g.:          ///  XmlReader r = ExecuteXmlReader(trans, "GetOrders", 24, 36);        /// 
              /// A valid SqlTransaction        /// The name of the stored procedure        /// An array of objects to be assigned as the input values of the stored procedure        /// 
      
       A dataset containing the resultset generated by the command
              public static XmlReader ExecuteXmlReader(SqlTransaction transaction, string spName, params object[] parameterValues)        {            if( transaction == null ) throw new ArgumentNullException( "transaction" );            if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );            // If we receive parameter values, we need to figure out where they go            if ((parameterValues != null) && (parameterValues.Length > 0))             {                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);                // Assign the provided values to these parameters based on parameter order                AssignParameterValues(commandParameters, parameterValues);                // Call the overload that takes an array of SqlParameters                return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);            }            else             {                // Otherwise we can just call the SP without params                return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);            }        }        #endregion ExecuteXmlReader        #region FillDataset        /// 
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in         /// the connection string.         /// 
        /// 
      
               /// e.g.:          ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});        /// 
              /// A valid connection string for a SqlConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// A dataset wich will contain the resultset generated by the command        /// This array will be used to create table mappings allowing the DataTables to be referenced        /// by a user defined name (probably the actual table name)        public static void FillDataset(string connectionString, CommandType commandType, string commandText, DataSet dataSet, string[] tableNames)        {            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );            if( dataSet == null ) throw new ArgumentNullException( "dataSet" );                        // Create & open a SqlConnection, and dispose of it after we are done            using (SqlConnection connection = new SqlConnection(connectionString))            {                connection.Open();                // Call the overload that takes a connection in place of the connection string                FillDataset(connection, commandType, commandText, dataSet, tableNames);            }        }        /// 
        /// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string         /// using the provided parameters.        /// 
        /// 
      
               /// e.g.:          ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));        /// 
              /// A valid connection string for a SqlConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// An array of SqlParamters used to execute the command        /// A dataset wich will contain the resultset generated by the command        /// This array will be used to create table mappings allowing the DataTables to be referenced        /// by a user defined name (probably the actual table name)        ///         public static void FillDataset(string connectionString, CommandType commandType,            string commandText, DataSet dataSet, string[] tableNames,            params SqlParameter[] commandParameters)        {            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );            if( dataSet == null ) throw new ArgumentNullException( "dataSet" );            // Create & open a SqlConnection, and dispose of it after we are done            using (SqlConnection connection = new SqlConnection(connectionString))            {                connection.Open();                // Call the overload that takes a connection in place of the connection string                FillDataset(connection, commandType, commandText, dataSet, tableNames, commandParameters);            }        }        /// 
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in         /// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.        /// 
        /// 
      
               /// This method provides no access to output parameters or the stored procedure's return value parameter.        ///         /// e.g.:          ///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, 24);        /// 
              /// A valid connection string for a SqlConnection        /// The name of the stored procedure        /// A dataset wich will contain the resultset generated by the command        /// This array will be used to create table mappings allowing the DataTables to be referenced        /// by a user defined name (probably the actual table name)        ///             /// An array of objects to be assigned as the input values of the stored procedure        public static void FillDataset(string connectionString, string spName,            DataSet dataSet, string[] tableNames,            params object[] parameterValues)        {            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );            if( dataSet == null ) throw new ArgumentNullException( "dataSet" );            // Create & open a SqlConnection, and dispose of it after we are done            using (SqlConnection connection = new SqlConnection(connectionString))            {                connection.Open();                // Call the overload that takes a connection in place of the connection string                FillDataset (connection, spName, dataSet, tableNames, parameterValues);            }        }        /// 
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection.         /// 
        /// 
      
               /// e.g.:          ///  FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});        /// 
              /// A valid SqlConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// A dataset wich will contain the resultset generated by the command        /// This array will be used to create table mappings allowing the DataTables to be referenced        /// by a user defined name (probably the actual table name)        ///             public static void FillDataset(SqlConnection connection, CommandType commandType,             string commandText, DataSet dataSet, string[] tableNames)        {            FillDataset(connection, commandType, commandText, dataSet, tableNames, null);        }        /// 
        /// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection         /// using the provided parameters.        /// 
        /// 
      
               /// e.g.:          ///  FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));        /// 
              /// A valid SqlConnection        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// A dataset wich will contain the resultset generated by the command        /// This array will be used to create table mappings allowing the DataTables to be referenced        /// by a user defined name (probably the actual table name)        ///         /// An array of SqlParamters used to execute the command        public static void FillDataset(SqlConnection connection, CommandType commandType,             string commandText, DataSet dataSet, string[] tableNames,            params SqlParameter[] commandParameters)        {            FillDataset(connection, null, commandType, commandText, dataSet, tableNames, commandParameters);        }        /// 
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection         /// using the provided parameter values.  This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.        /// 
        /// 
      
               /// This method provides no access to output parameters or the stored procedure's return value parameter.        ///         /// e.g.:          ///  FillDataset(conn, "GetOrders", ds, new string[] {"orders"}, 24, 36);        /// 
              /// A valid SqlConnection        /// The name of the stored procedure        /// A dataset wich will contain the resultset generated by the command        /// This array will be used to create table mappings allowing the DataTables to be referenced        /// by a user defined name (probably the actual table name)        ///         /// An array of objects to be assigned as the input values of the stored procedure        public static void FillDataset(SqlConnection connection, string spName,             DataSet dataSet, string[] tableNames,            params object[] parameterValues)        {            if ( connection == null ) throw new ArgumentNullException( "connection" );            if (dataSet == null ) throw new ArgumentNullException( "dataSet" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );            // If we receive parameter values, we need to figure out where they go            if ((parameterValues != null) && (parameterValues.Length > 0))             {                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);                // Assign the provided values to these parameters based on parameter order                AssignParameterValues(commandParameters, parameterValues);                // Call the overload that takes an array of SqlParameters                FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);            }            else             {                // Otherwise we can just call the SP without params                FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames);            }            }        /// 
        /// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction.         /// 
        /// 
      
               /// e.g.:          ///  FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});        /// 
              /// A valid SqlTransaction        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// A dataset wich will contain the resultset generated by the command        /// This array will be used to create table mappings allowing the DataTables to be referenced        /// by a user defined name (probably the actual table name)        ///         public static void FillDataset(SqlTransaction transaction, CommandType commandType,             string commandText,            DataSet dataSet, string[] tableNames)        {            FillDataset (transaction, commandType, commandText, dataSet, tableNames, null);            }        /// 
        /// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction        /// using the provided parameters.        /// 
        /// 
      
               /// e.g.:          ///  FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));        /// 
              /// A valid SqlTransaction        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// A dataset wich will contain the resultset generated by the command        /// This array will be used to create table mappings allowing the DataTables to be referenced        /// by a user defined name (probably the actual table name)        ///         /// An array of SqlParamters used to execute the command        public static void FillDataset(SqlTransaction transaction, CommandType commandType,             string commandText, DataSet dataSet, string[] tableNames,            params SqlParameter[] commandParameters)        {            FillDataset(transaction.Connection, transaction, commandType, commandText, dataSet, tableNames, commandParameters);        }        /// 
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified         /// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.        /// 
        /// 
      
               /// This method provides no access to output parameters or the stored procedure's return value parameter.        ///         /// e.g.:          ///  FillDataset(trans, "GetOrders", ds, new string[]{"orders"}, 24, 36);        /// 
              /// A valid SqlTransaction        /// The name of the stored procedure        /// A dataset wich will contain the resultset generated by the command        /// This array will be used to create table mappings allowing the DataTables to be referenced        /// by a user defined name (probably the actual table name)        ///         /// An array of objects to be assigned as the input values of the stored procedure        public static void FillDataset(SqlTransaction transaction, string spName,            DataSet dataSet, string[] tableNames,            params object[] parameterValues)         {            if( transaction == null ) throw new ArgumentNullException( "transaction" );            if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );            if( dataSet == null ) throw new ArgumentNullException( "dataSet" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );            // If we receive parameter values, we need to figure out where they go            if ((parameterValues != null) && (parameterValues.Length > 0))             {                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);                // Assign the provided values to these parameters based on parameter order                AssignParameterValues(commandParameters, parameterValues);                // Call the overload that takes an array of SqlParameters                FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);            }            else             {                // Otherwise we can just call the SP without params                FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames);            }            }        /// 
        /// Private helper method that execute a SqlCommand (that returns a resultset) against the specified SqlTransaction and SqlConnection        /// using the provided parameters.        /// 
        /// 
      
               /// e.g.:          ///  FillDataset(conn, trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));        /// 
              /// A valid SqlConnection        /// A valid SqlTransaction        /// The CommandType (stored procedure, text, etc.)        /// The stored procedure name or T-SQL command        /// A dataset wich will contain the resultset generated by the command        /// This array will be used to create table mappings allowing the DataTables to be referenced        /// by a user defined name (probably the actual table name)        ///         /// An array of SqlParamters used to execute the command        private static void FillDataset(SqlConnection connection, SqlTransaction transaction, CommandType commandType,             string commandText, DataSet dataSet, string[] tableNames,            params SqlParameter[] commandParameters)        {            if( connection == null ) throw new ArgumentNullException( "connection" );            if( dataSet == null ) throw new ArgumentNullException( "dataSet" );            // Create a command and prepare it for execution            SqlCommand command = new SqlCommand();            bool mustCloseConnection = false;            PrepareCommand(command, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection );                            // Create the DataAdapter & DataSet            using( SqlDataAdapter dataAdapter = new SqlDataAdapter(command) )            {                                // Add the table mappings specified by the user                if (tableNames != null && tableNames.Length > 0)                {                    string tableName = "Table";                    for (int index=0; index < tableNames.Length; index++)                    {                        if( tableNames[index] == null || tableNames[index].Length == 0 ) throw new ArgumentException( "The tableNames parameter must contain a list of tables, a value was provided as null or empty string.", "tableNames" );                        dataAdapter.TableMappings.Add(tableName, tableNames[index]);                        tableName += (index + 1).ToString();                    }                }                                // Fill the DataSet using default values for DataTable names, etc                dataAdapter.Fill(dataSet);                // Detach the SqlParameters from the command object, so they can be used again                command.Parameters.Clear();            }            if( mustCloseConnection )                connection.Close();        }        #endregion                #region UpdateDataset        /// 
        /// Executes the respective command for each inserted, updated, or deleted row in the DataSet.        /// 
        /// 
      
               /// e.g.:          ///  UpdateDataset(conn, insertCommand, deleteCommand, updateCommand, dataSet, "Order");        /// 
              /// A valid transact-SQL statement or stored procedure to insert new records into the data source        /// A valid transact-SQL statement or stored procedure to delete records from the data source        /// A valid transact-SQL statement or stored procedure used to update records in the data source        /// The DataSet used to update the data source        /// The DataTable used to update the data source.        public static void UpdateDataset(SqlCommand insertCommand, SqlCommand deleteCommand, SqlCommand updateCommand, DataSet dataSet, string tableName)        {            if( insertCommand == null ) throw new ArgumentNullException( "insertCommand" );            if( deleteCommand == null ) throw new ArgumentNullException( "deleteCommand" );            if( updateCommand == null ) throw new ArgumentNullException( "updateCommand" );            if( tableName == null || tableName.Length == 0 ) throw new ArgumentNullException( "tableName" );             // Create a SqlDataAdapter, and dispose of it after we are done            using (SqlDataAdapter dataAdapter = new SqlDataAdapter())            {                // Set the data adapter commands                dataAdapter.UpdateCommand = updateCommand;                dataAdapter.InsertCommand = insertCommand;                dataAdapter.DeleteCommand = deleteCommand;                // Update the dataset changes in the data source                dataAdapter.Update (dataSet, tableName);                 // Commit all the changes made to the DataSet                dataSet.AcceptChanges();            }        }        #endregion        #region CreateCommand        /// 
        /// Simplify the creation of a Sql command object by allowing        /// a stored procedure and optional parameters to be provided        /// 
        /// 
      
               /// e.g.:          ///  SqlCommand command = CreateCommand(conn, "AddCustomer", "CustomerID", "CustomerName");        /// 
              /// A valid SqlConnection object        /// The name of the stored procedure        /// An array of string to be assigned as the source columns of the stored procedure parameters        /// 
      
       A valid SqlCommand object
              public static SqlCommand CreateCommand(SqlConnection connection, string spName, params string[] sourceColumns)         {            if( connection == null ) throw new ArgumentNullException( "connection" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );            // Create a SqlCommand            SqlCommand cmd = new SqlCommand( spName, connection );            cmd.CommandType = CommandType.StoredProcedure;            // If we receive parameter values, we need to figure out where they go            if ((sourceColumns != null) && (sourceColumns.Length > 0))             {                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);                // Assign the provided source columns to these parameters based on parameter order                for (int index=0; index < sourceColumns.Length; index++)                    commandParameters[index].SourceColumn = sourceColumns[index];                // Attach the discovered parameters to the SqlCommand object                AttachParameters (cmd, commandParameters);            }            return cmd;        }        #endregion        #region ExecuteNonQueryTypedParams        /// 
        /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the database specified in         /// the connection string using the dataRow column values as the stored procedure's parameters values.        /// This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.        /// 
        /// A valid connection string for a SqlConnection        /// The name of the stored procedure        /// The dataRow used to hold the stored procedure's parameter values.        /// 
      
       An int representing the number of rows affected by the command
              public static int ExecuteNonQueryTypedParams(String connectionString, String spName, DataRow dataRow)        {            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );                        // If the row has values, the store procedure parameters must be initialized            if (dataRow != null && dataRow.ItemArray.Length > 0)            {                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);                                // Set the parameters values                AssignParameterValues(commandParameters, dataRow);                                                return SqlHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                return SqlHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);            }        }        /// 
        /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified SqlConnection         /// using the dataRow column values as the stored procedure's parameters values.          /// This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.        /// 
        /// A valid SqlConnection object        /// The name of the stored procedure        /// The dataRow used to hold the stored procedure's parameter values.        /// 
      
       An int representing the number of rows affected by the command
              public static int ExecuteNonQueryTypedParams(SqlConnection connection, String spName, DataRow dataRow)        {            if( connection == null ) throw new ArgumentNullException( "connection" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );            // If the row has values, the store procedure parameters must be initialized            if (dataRow != null && dataRow.ItemArray.Length > 0)            {                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);                                // Set the parameters values                AssignParameterValues(commandParameters, dataRow);                                                return SqlHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                return SqlHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);            }        }        /// 
        /// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified        /// SqlTransaction using the dataRow column values as the stored procedure's parameters values.        /// This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.        /// 
        /// A valid SqlTransaction object        /// The name of the stored procedure        /// The dataRow used to hold the stored procedure's parameter values.        /// 
      
       An int representing the number of rows affected by the command
              public static int ExecuteNonQueryTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)        {            if( transaction == null ) throw new ArgumentNullException( "transaction" );            if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );            // Sf the row has values, the store procedure parameters must be initialized            if (dataRow != null && dataRow.ItemArray.Length > 0)            {                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);                                // Set the parameters values                AssignParameterValues(commandParameters, dataRow);                                                return SqlHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                return SqlHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);            }        }        #endregion        #region ExecuteDatasetTypedParams        /// 
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in         /// the connection string using the dataRow column values as the stored procedure's parameters values.        /// This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.        /// 
        /// A valid connection string for a SqlConnection        /// The name of the stored procedure        /// The dataRow used to hold the stored procedure's parameter values.        /// 
      
       A dataset containing the resultset generated by the command
              public static DataSet ExecuteDatasetTypedParams(string connectionString, String spName, DataRow dataRow)        {            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );            //If the row has values, the store procedure parameters must be initialized            if ( dataRow != null && dataRow.ItemArray.Length > 0)            {                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);                                // Set the parameters values                AssignParameterValues(commandParameters, dataRow);                                return SqlHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                return SqlHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);            }        }        /// 
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection         /// using the dataRow column values as the store procedure's parameters values.        /// This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.        /// 
        /// A valid SqlConnection object        /// The name of the stored procedure        /// The dataRow used to hold the stored procedure's parameter values.        /// 
      
       A dataset containing the resultset generated by the command
              public static DataSet ExecuteDatasetTypedParams(SqlConnection connection, String spName, DataRow dataRow)        {            if( connection == null ) throw new ArgumentNullException( "connection" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );            // If the row has values, the store procedure parameters must be initialized            if( dataRow != null && dataRow.ItemArray.Length > 0)            {                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);                                // Set the parameters values                AssignParameterValues(commandParameters, dataRow);                                return SqlHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                return SqlHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName);            }        }        /// 
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlTransaction         /// using the dataRow column values as the stored procedure's parameters values.        /// This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on row values.        /// 
        /// A valid SqlTransaction object        /// The name of the stored procedure        /// The dataRow used to hold the stored procedure's parameter values.        /// 
      
       A dataset containing the resultset generated by the command
              public static DataSet ExecuteDatasetTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)        {            if( transaction == null ) throw new ArgumentNullException( "transaction" );            if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );            // If the row has values, the store procedure parameters must be initialized            if( dataRow != null && dataRow.ItemArray.Length > 0)            {                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);                                // Set the parameters values                AssignParameterValues(commandParameters, dataRow);                                return SqlHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                return SqlHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName);            }        }        #endregion        #region ExecuteReaderTypedParams        /// 
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in         /// the connection string using the dataRow column values as the stored procedure's parameters values.        /// This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.        /// 
        /// A valid connection string for a SqlConnection        /// The name of the stored procedure        /// The dataRow used to hold the stored procedure's parameter values.        /// 
      
       A SqlDataReader containing the resultset generated by the command
              public static SqlDataReader ExecuteReaderTypedParams(String connectionString, String spName, DataRow dataRow)        {            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );                        // If the row has values, the store procedure parameters must be initialized            if ( dataRow != null && dataRow.ItemArray.Length > 0 )            {                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);                                // Set the parameters values                AssignParameterValues(commandParameters, dataRow);                                return SqlHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                return SqlHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName);            }        }                        /// 
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection         /// using the dataRow column values as the stored procedure's parameters values.        /// This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.        /// 
        /// A valid SqlConnection object        /// The name of the stored procedure        /// The dataRow used to hold the stored procedure's parameter values.        /// 
      
       A SqlDataReader containing the resultset generated by the command
              public static SqlDataReader ExecuteReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)        {            if( connection == null ) throw new ArgumentNullException( "connection" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );            // If the row has values, the store procedure parameters must be initialized            if( dataRow != null && dataRow.ItemArray.Length > 0)            {                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);                                // Set the parameters values                AssignParameterValues(commandParameters, dataRow);                                return SqlHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                return SqlHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName);            }        }                /// 
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlTransaction         /// using the dataRow column values as the stored procedure's parameters values.        /// This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.        /// 
        /// A valid SqlTransaction object        /// The name of the stored procedure        /// The dataRow used to hold the stored procedure's parameter values.        /// 
      
       A SqlDataReader containing the resultset generated by the command
              public static SqlDataReader ExecuteReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)        {            if( transaction == null ) throw new ArgumentNullException( "transaction" );            if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );            // If the row has values, the store procedure parameters must be initialized            if( dataRow != null && dataRow.ItemArray.Length > 0 )            {                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);                                // Set the parameters values                AssignParameterValues(commandParameters, dataRow);                                return SqlHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                return SqlHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName);            }        }        #endregion        #region ExecuteScalarTypedParams        /// 
        /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the database specified in         /// the connection string using the dataRow column values as the stored procedure's parameters values.        /// This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.        /// 
        /// A valid connection string for a SqlConnection        /// The name of the stored procedure        /// The dataRow used to hold the stored procedure's parameter values.        /// 
      
       An object containing the value in the 1x1 resultset generated by the command
              public static object ExecuteScalarTypedParams(String connectionString, String spName, DataRow dataRow)        {            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );                        // If the row has values, the store procedure parameters must be initialized            if( dataRow != null && dataRow.ItemArray.Length > 0)            {                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);                                // Set the parameters values                AssignParameterValues(commandParameters, dataRow);                                return SqlHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                return SqlHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);            }        }        /// 
        /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection         /// using the dataRow column values as the stored procedure's parameters values.        /// This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.        /// 
        /// A valid SqlConnection object        /// The name of the stored procedure        /// The dataRow used to hold the stored procedure's parameter values.        /// 
      
       An object containing the value in the 1x1 resultset generated by the command
              public static object ExecuteScalarTypedParams(SqlConnection connection, String spName, DataRow dataRow)        {            if( connection == null ) throw new ArgumentNullException( "connection" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );            // If the row has values, the store procedure parameters must be initialized            if( dataRow != null && dataRow.ItemArray.Length > 0)            {                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);                                // Set the parameters values                AssignParameterValues(commandParameters, dataRow);                                return SqlHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                return SqlHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName);            }        }        /// 
        /// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified SqlTransaction        /// using the dataRow column values as the stored procedure's parameters values.        /// This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.        /// 
        /// A valid SqlTransaction object        /// The name of the stored procedure        /// The dataRow used to hold the stored procedure's parameter values.        /// 
      
       An object containing the value in the 1x1 resultset generated by the command
              public static object ExecuteScalarTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)        {            if( transaction == null ) throw new ArgumentNullException( "transaction" );            if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );            // If the row has values, the store procedure parameters must be initialized            if( dataRow != null && dataRow.ItemArray.Length > 0)            {                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);                                // Set the parameters values                AssignParameterValues(commandParameters, dataRow);                                return SqlHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                return SqlHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName);            }        }        #endregion        #region ExecuteXmlReaderTypedParams        /// 
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection         /// using the dataRow column values as the stored procedure's parameters values.        /// This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.        /// 
        /// A valid SqlConnection object        /// The name of the stored procedure        /// The dataRow used to hold the stored procedure's parameter values.        /// 
      
       An XmlReader containing the resultset generated by the command
              public static XmlReader ExecuteXmlReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)        {            if( connection == null ) throw new ArgumentNullException( "connection" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );            // If the row has values, the store procedure parameters must be initialized            if( dataRow != null && dataRow.ItemArray.Length > 0)            {                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);                                // Set the parameters values                AssignParameterValues(commandParameters, dataRow);                                return SqlHelper.ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                return SqlHelper.ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);            }        }        /// 
        /// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlTransaction         /// using the dataRow column values as the stored procedure's parameters values.        /// This method will query the database to discover the parameters for the         /// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.        /// 
        /// A valid SqlTransaction object        /// The name of the stored procedure        /// The dataRow used to hold the stored procedure's parameter values.        /// 
      
       An XmlReader containing the resultset generated by the command
              public static XmlReader ExecuteXmlReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)        {            if( transaction == null ) throw new ArgumentNullException( "transaction" );            if( transaction != null && transaction.Connection == null ) throw new ArgumentException( "The transaction was rollbacked or commited, please provide an open transaction.", "transaction" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );            // If the row has values, the store procedure parameters must be initialized            if( dataRow != null && dataRow.ItemArray.Length > 0)            {                // Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);                                // Set the parameters values                AssignParameterValues(commandParameters, dataRow);                                return SqlHelper.ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);            }            else            {                return SqlHelper.ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);            }        }        #endregion    }    /// 
    /// SqlHelperParameterCache provides functions to leverage a static cache of procedure parameters, and the    /// ability to discover parameters for stored procedures at run-time.    /// 
    public sealed class SqlHelperParameterCache    {        #region private methods, variables, and constructors        //Since this class provides only static methods, make the default constructor private to prevent         //instances from being created with "new SqlHelperParameterCache()"        private SqlHelperParameterCache() {}        private static Hashtable paramCache = Hashtable.Synchronized(new Hashtable());        /// 
        /// Resolve at run time the appropriate set of SqlParameters for a stored procedure        /// 
        /// A valid SqlConnection object        /// The name of the stored procedure        /// Whether or not to include their return value parameter        /// 
      
       The parameter array discovered.
              private static SqlParameter[] DiscoverSpParameterSet(SqlConnection connection, string spName, bool includeReturnValueParameter)        {            if( connection == null ) throw new ArgumentNullException( "connection" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );            SqlCommand cmd = new SqlCommand(spName, connection);            cmd.CommandType = CommandType.StoredProcedure;            connection.Open();            SqlCommandBuilder.DeriveParameters(cmd);            connection.Close();            if (!includeReturnValueParameter)             {                cmd.Parameters.RemoveAt(0);            }                            SqlParameter[] discoveredParameters = new SqlParameter[cmd.Parameters.Count];            cmd.Parameters.CopyTo(discoveredParameters, 0);            // Init the parameters with a DBNull value            foreach (SqlParameter discoveredParameter in discoveredParameters)            {                discoveredParameter.Value = DBNull.Value;            }            return discoveredParameters;        }        /// 
        /// Deep copy of cached SqlParameter array        /// 
        ///         /// 
              private static SqlParameter[] CloneParameters(SqlParameter[] originalParameters)        {            SqlParameter[] clonedParameters = new SqlParameter[originalParameters.Length];            for (int i = 0, j = originalParameters.Length; i < j; i++)            {                clonedParameters[i] = (SqlParameter)((ICloneable)originalParameters[i]).Clone();            }            return clonedParameters;        }        #endregion private methods, variables, and constructors        #region caching functions        /// 
        /// Add parameter array to the cache        /// 
        /// A valid connection string for a SqlConnection        /// The stored procedure name or T-SQL command        /// An array of SqlParamters to be cached        public static void CacheParameterSet(string connectionString, string commandText, params SqlParameter[] commandParameters)        {            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );            if( commandText == null || commandText.Length == 0 ) throw new ArgumentNullException( "commandText" );            string hashKey = connectionString + ":" + commandText;            paramCache[hashKey] = commandParameters;        }        /// 
        /// Retrieve a parameter array from the cache        /// 
        /// A valid connection string for a SqlConnection        /// The stored procedure name or T-SQL command        /// 
      
       An array of SqlParamters
              public static SqlParameter[] GetCachedParameterSet(string connectionString, string commandText)        {            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );            if( commandText == null || commandText.Length == 0 ) throw new ArgumentNullException( "commandText" );            string hashKey = connectionString + ":" + commandText;            SqlParameter[] cachedParameters = paramCache[hashKey] as SqlParameter[];            if (cachedParameters == null)            {                            return null;            }            else            {                return CloneParameters(cachedParameters);            }        }        #endregion caching functions        #region Parameter Discovery Functions        /// 
        /// Retrieves the set of SqlParameters appropriate for the stored procedure        /// 
        /// 
      
               /// This method will query the database for this information, and then store it in a cache for future requests.        /// 
              /// A valid connection string for a SqlConnection        /// The name of the stored procedure        /// 
      
       An array of SqlParameters
              public static SqlParameter[] GetSpParameterSet(string connectionString, string spName)        {            return GetSpParameterSet(connectionString, spName, false);        }        /// 
        /// Retrieves the set of SqlParameters appropriate for the stored procedure        /// 
        /// 
      
               /// This method will query the database for this information, and then store it in a cache for future requests.        /// 
              /// A valid connection string for a SqlConnection        /// The name of the stored procedure        /// A bool value indicating whether the return value parameter should be included in the results        /// 
      
       An array of SqlParameters
              public static SqlParameter[] GetSpParameterSet(string connectionString, string spName, bool includeReturnValueParameter)        {            if( connectionString == null || connectionString.Length == 0 ) throw new ArgumentNullException( "connectionString" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );            using(SqlConnection connection = new SqlConnection(connectionString))            {                return GetSpParameterSetInternal(connection, spName, includeReturnValueParameter);            }        }        /// 
        /// Retrieves the set of SqlParameters appropriate for the stored procedure        /// 
        /// 
      
               /// This method will query the database for this information, and then store it in a cache for future requests.        /// 
              /// A valid SqlConnection object        /// The name of the stored procedure        /// 
      
       An array of SqlParameters
              internal static SqlParameter[] GetSpParameterSet(SqlConnection connection, string spName)        {            return GetSpParameterSet(connection, spName, false);        }        /// 
        /// Retrieves the set of SqlParameters appropriate for the stored procedure        /// 
        /// 
      
               /// This method will query the database for this information, and then store it in a cache for future requests.        /// 
              /// A valid SqlConnection object        /// The name of the stored procedure        /// A bool value indicating whether the return value parameter should be included in the results        /// 
      
       An array of SqlParameters
              internal static SqlParameter[] GetSpParameterSet(SqlConnection connection, string spName, bool includeReturnValueParameter)        {            if( connection == null ) throw new ArgumentNullException( "connection" );            using (SqlConnection clonedConnection = (SqlConnection)((ICloneable)connection).Clone())            {                return GetSpParameterSetInternal(clonedConnection, spName, includeReturnValueParameter);            }        }        /// 
        /// Retrieves the set of SqlParameters appropriate for the stored procedure        /// 
        /// A valid SqlConnection object        /// The name of the stored procedure        /// A bool value indicating whether the return value parameter should be included in the results        /// 
      
       An array of SqlParameters
              private static SqlParameter[] GetSpParameterSetInternal(SqlConnection connection, string spName, bool includeReturnValueParameter)        {            if( connection == null ) throw new ArgumentNullException( "connection" );            if( spName == null || spName.Length == 0 ) throw new ArgumentNullException( "spName" );            string hashKey = connection.ConnectionString + ":" + spName + (includeReturnValueParameter ? ":include ReturnValue Parameter":"");            SqlParameter[] cachedParameters;                        cachedParameters = paramCache[hashKey] as SqlParameter[];            if (cachedParameters == null)            {                    SqlParameter[] spParameters = DiscoverSpParameterSet(connection, spName, includeReturnValueParameter);                paramCache[hashKey] = spParameters;                cachedParameters = spParameters;            }                        return CloneParameters(cachedParameters);        }        /// 
        /// 清空缓存参数        /// 
        public static void  ClearCache()        {            paramCache.Clear();        }        #endregion Parameter Discovery Functions    }}