SqlHelper.cs

// http://msdn.microsoft.com/library/en-us/dnbda/html/daab-rm.asp


using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Collections.Generic;
using System.Xml;
using System.Collections;


namespace DBLibrary
{
   
    public sealed class SqlHelper
    {
       
       
        #region private utility methods & constructors

       
        private SqlHelper() {}



       
        private static void AttachParameters(SqlCommand command, SqlParameter[] commandParameters)
        {
            foreach (SqlParameter p in commandParameters)
            {
                //check for derived output value with no value assigned
                if ((p.Direction == ParameterDirection.InputOutput) && (p.Value == null))
                {
                    p.Value = DBNull.Value;
                }
               
                command.Parameters.Add(p);
            }
        }

   
        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++)
            {
                commandParameters[i].Value = parameterValues[i];
            }
        }

       
        private static void PrepareCommand(SqlCommand command, SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters)
        {
            //if the provided connection is not open, we will open it
            if (connection.State != ConnectionState.Open)
            {
                connection.Open();
            }

            //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)
            {
                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

       
        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);
        }

       
        public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            CnSettings objCN = new CnSettings();

            //create & open a SqlConnection, and dispose of it after we are done.
            using (SqlConnection cn = new SqlConnection(objCN.getdb()))
            {
                try
                {
                    cn.Open();

                    //call the overload that takes a connection in place of the connection string
                    return ExecuteNonQuery(cn, commandType, commandText, commandParameters);
                }
                finally
                {
                    cn.Dispose();
                    }
            }
        }

       
        public static int ExecuteNonQuery(string connectionString, string spName, params object[] parameterValues)
        {
            //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);
            }
                //otherwise we can just call the SP without params
            else
            {
                return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
            }
        }

       
        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);
        }

       
        public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {   
            //create a command and prepare it for execution
            SqlCommand cmd = new SqlCommand();
           
            PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters);
           
            //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;
        }

       
        public static int ExecuteNonQuery(SqlConnection connection, string spName, params object[] parameterValues)
        {
            //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.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(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
                //otherwise we can just call the SP without params
            else
            {
                return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
            }
        }

       
        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);
        }

   
        public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            //create a command and prepare it for execution
            SqlCommand cmd = new SqlCommand();
           
            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters);
           
            //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;
        }

   
        public static int ExecuteNonQuery(SqlTransaction transaction, string spName, params object[] parameterValues)
        {
            //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.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(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
                //otherwise we can just call the SP without params
            else
            {
                return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
            }
        }


        #endregion ExecuteNonQuery

        #region ExecuteDataSet



      


      
       
        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);
        }

       
        public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            CnSettings objCN = new CnSettings();
            //create & open a SqlConnection, and dispose of it after we are done.
            using (SqlConnection cn = new SqlConnection(objCN.getdb()))
            {
                try
                {
                    cn.Open();
                   
                    //call the overload that takes a connection in place of the connection string
                    return ExecuteDataset(cn, commandType, commandText, commandParameters);
                }
              catch (Exception ex) { throw (ex); }
                finally
                {
                    cn.Dispose();
                }

            }
       
        }

       
        public static DataSet ExecuteDataset(string connectionString, string spName, params object[] parameterValues)
        {
            //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);
            }
                //otherwise we can just call the SP without params
            else
            {
                return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);
            }
        }

   
        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);
        }
       
       
        public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            //create a command and prepare it for execution
            SqlCommand cmd = new SqlCommand();
           
            PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters);
           
            //create the DataAdapter & DataSet
            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
            connection.Close();
            return ds;                       
        }
       
       
        public static DataSet ExecuteDataset(SqlConnection connection, string spName, params object[] parameterValues)
        {
            //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.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(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
                //otherwise we can just call the SP without params
            else
            {
                return ExecuteDataset(connection, CommandType.StoredProcedure, spName);
            }
        }

       
        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);
        }
       
       
        public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            //create a command and prepare it for execution
            SqlCommand cmd = new SqlCommand();
       
            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters);
           
            //create the DataAdapter & DataSet
            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;
        }
       
       
        public static DataSet ExecuteDataset(SqlTransaction transaction, string spName, params object[] parameterValues)
        {
            //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.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(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
                //otherwise we can just call the SP without params
            else
            {
                return ExecuteDataset(transaction, CommandType.StoredProcedure, spName);
            }
        }

        #endregion ExecuteDataSet
       
        #region ExecuteReader

       
        private enum SqlConnectionOwnership   
        {
            /// <summary>Connection is owned and managed by SqlHelper</summary>
            Internal,
            /// <summary>Connection is owned and managed by the caller</summary>
            External
        }

       
        private static SqlDataReader ExecuteReader(SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, SqlConnectionOwnership connectionOwnership)
        {   
            //create a command and prepare it for execution
            SqlCommand cmd = new SqlCommand();
       
            PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters);
           
            //create a reader
            SqlDataReader dr;

            // call ExecuteReader with the appropriate CommandBehavior
            if (connectionOwnership == SqlConnectionOwnership.External)
            {
                dr = cmd.ExecuteReader();
            }
            else
            {
                dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            }
           
            // detach the SqlParameters from the command object, so they can be used again.
            cmd.Parameters.Clear();
           
            return dr;
        }

       
        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);
        }

       
        public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            CnSettings objCN = new CnSettings();
            //create & open a SqlConnection
            SqlConnection cn = new SqlConnection(objCN.getdb());
            cn.Open();

            try
            {
                //call the private overload that takes an internally owned connection in place of the connection string
                return ExecuteReader(cn, null, commandType, commandText, commandParameters, SqlConnectionOwnership.Internal);
            }
            catch(Exception ex)
            {
                //DBLayer.DBLInstance.GlobalInstance.ExceptionAndEventHandling(ex);
                //if we fail to return the SqlDatReader, we need to close the connection ourselves
                cn.Close();
                throw ex;
                return null;
               
            }

             

        }

       
        public static SqlDataReader ExecuteReader(string connectionString, string spName, params   object[] parameterValues)
        {
            //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 ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
                //otherwise we can just call the SP without params
            else
            {
                return ExecuteReader(connectionString, CommandType.StoredProcedure, spName);
            }
        }

       
        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);
        }

       
        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);
        }

       
        public static SqlDataReader ExecuteReader(SqlConnection connection, string spName, params object[] parameterValues)
        {
            //if we receive parameter values, we need to figure out where they go
            if ((parameterValues != null) && (parameterValues.Length > 0))
            {
                SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection.ConnectionString, spName);

                AssignParameterValues(commandParameters, parameterValues);

                return ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
                //otherwise we can just call the SP without params
            else
            {
                return ExecuteReader(connection, CommandType.StoredProcedure, spName);
            }
        }

       
        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);
        }

       
        public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            //pass through to private overload, indicating that the connection is owned by the caller
            return ExecuteReader(transaction.Connection, transaction, commandType, commandText, commandParameters, SqlConnectionOwnership.External);
        }

       
        public static SqlDataReader ExecuteReader(SqlTransaction transaction, string spName, params object[] parameterValues)
        {
            //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.ConnectionString, spName);

                AssignParameterValues(commandParameters, parameterValues);

                return ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
                //otherwise we can just call the SP without params
            else
            {
                return ExecuteReader(transaction, CommandType.StoredProcedure, spName);
            }
        }


        #endregion ExecuteReader

        #region ExecuteScalar
       
       
        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);
        }

       
        public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            CnSettings objCN = new CnSettings();
            //create & open a SqlConnection, and dispose of it after we are done.
            using (SqlConnection cn = new SqlConnection(objCN.getdb()))
            {
                cn.Open();

                //call the overload that takes a connection in place of the connection string
                return ExecuteScalar(cn, commandType, commandText, commandParameters);
               
            }
        }

   
        public static object ExecuteScalar(string connectionString, string spName, params object[] parameterValues)
        {
            //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);
            }
                //otherwise we can just call the SP without params
            else
            {
                return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);
            }
        }

       
        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);
        }

       
        public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            //create a command and prepare it for execution
            SqlCommand cmd = new SqlCommand();
            PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters);
           
            //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();
            connection.Close ();

            return retval;
           
        }

       
        public static object ExecuteScalar(SqlConnection connection, string spName, params object[] parameterValues)
        {
            //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.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(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
                //otherwise we can just call the SP without params
            else
            {
                return ExecuteScalar(connection, CommandType.StoredProcedure, spName);
            }
        }

       
        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);
        }

       
        public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            //create a command and prepare it for execution
            SqlCommand cmd = new SqlCommand();
            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters);
           
            //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();
            transaction.Connection.Close();
            return retval;
        }

       
        public static object ExecuteScalar(SqlTransaction transaction, string spName, params object[] parameterValues)
        {
            //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.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(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
                //otherwise we can just call the SP without params
            else
            {
                return ExecuteScalar(transaction, CommandType.StoredProcedure, spName);
            }
        }

        #endregion ExecuteScalar   
   
        #region ExecuteXmlReader

        public  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);
        }

       
        public  XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            //create a command and prepare it for execution
            SqlCommand cmd = new SqlCommand();
           
            PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters);
           
            //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;
           
        }

       
        public  XmlReader ExecuteXmlReader(SqlConnection connection, string spName, params object[] parameterValues)
        {
            //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.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 ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
                //otherwise we can just call the SP without params
            else
            {
                return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);
            }
        }

       
        public  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);
        }

        public  XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            //create a command and prepare it for execution
            SqlCommand cmd = new SqlCommand();
       
            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters);
           
            //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;           
        }

       
        public  XmlReader ExecuteXmlReader(SqlTransaction transaction, string spName, params object[] parameterValues)
        {
            //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.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 ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
                //otherwise we can just call the SP without params
            else
            {
                return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);
            }
        }


        #endregion ExecuteXmlReader
        #region ExecuteDataTable

     
        public static DataTable ExecuteDataTable(string connectionString, CommandType commandType, string commandText)
        {
            //pass through the call providing null for the set of SqlParameters
            return ExecuteDataTable(connectionString, commandType, commandText, (SqlParameter[])null);
        }

     
        public static DataTable ExecuteDataTable(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            CnSettings objCN = new CnSettings();
            //create & open a SqlConnection, and dispose of it after we are done.
            using (SqlConnection cn = new SqlConnection(objCN.getdb()))
            {
                try
                {
                    cn.Open();

                    //call the overload that takes a connection in place of the connection string
                    return ExecuteDataTable(cn, commandType, commandText, commandParameters);
                }
                finally
                {
                    cn.Dispose();
                }

            }
        }

     
        public static DataTable ExecuteDataTable(string connectionString, string spName, params object[] parameterValues)
        {
            //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 ExecuteDataTable(connectionString, CommandType.StoredProcedure, spName, commandParameters);
            }
            //otherwise we can just call the SP without params
            else
            {
                return ExecuteDataTable(connectionString, CommandType.StoredProcedure, spName);
            }
        }

      
        public static DataTable ExecuteDataTable(SqlConnection connection, CommandType commandType, string commandText)
        {
            //pass through the call providing null for the set of SqlParameters
            return ExecuteDataTable(connection, commandType, commandText, (SqlParameter[])null);
        }

     
        public static DataTable ExecuteDataTable(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            //create a command and prepare it for execution
            SqlCommand cmd = new SqlCommand();

            PrepareCommand(cmd, connection, (SqlTransaction)null, commandType, commandText, commandParameters);

            //create the DataAdapter & DataSet
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataTable dt = new DataTable();

            //fill the DataSet using default values for DataTable names, etc.
            da.Fill(dt);

            // detach the SqlParameters from the command object, so they can be used again.
            cmd.Parameters.Clear();

            //return the dataset
            connection.Close();
            return dt;
        }

      
        public static DataTable ExecuteDataTable(SqlConnection connection, string spName, params object[] parameterValues)
        {
            //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.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 ExecuteDataTable(connection, CommandType.StoredProcedure, spName, commandParameters);
            }
            //otherwise we can just call the SP without params
            else
            {
                return ExecuteDataTable(connection, CommandType.StoredProcedure, spName);
            }
        }

      
        public static DataTable ExecuteDataTable(SqlTransaction transaction, CommandType commandType, string commandText)
        {
            //pass through the call providing null for the set of SqlParameters
            return ExecuteDataTable(transaction, commandType, commandText, (SqlParameter[])null);
        }

    
        public static DataTable ExecuteDataTable(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
        {
            //create a command and prepare it for execution
            SqlCommand cmd = new SqlCommand();

            PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters);

            //create the DataAdapter & DataSet
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataTable dt = new DataTable();

            //fill the DataSet using default values for DataTable names, etc.
            da.Fill(dt);

            // detach the SqlParameters from the command object, so they can be used again.
            cmd.Parameters.Clear();


            //return the dataset
            return dt;
        }

    
        public static DataTable ExecuteDataTable(SqlTransaction transaction, string spName, params object[] parameterValues)
        {
            //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.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 ExecuteDataTable(transaction, CommandType.StoredProcedure, spName, commandParameters);
            }
            //otherwise we can just call the SP without params
            else
            {
                return ExecuteDataTable(transaction, CommandType.StoredProcedure, spName);
            }
        }

        #endregion ExecuteDataTable
       
    }

   
    public sealed class SqlHelperParameterCache
    {
        CnSettings objCN = new CnSettings();

      
        #region private methods, variables, and constructors

       
        private SqlHelperParameterCache() {}

        private static Hashtable paramCache = Hashtable.Synchronized(new Hashtable());

   
        private static SqlParameter[] DiscoverSpParameterSet(string connectionString, string spName, bool includeReturnValueParameter)
        {
            CnSettings objCN = new CnSettings();
            using (SqlConnection cn = new SqlConnection(objCN.getdb()))
            using (SqlCommand cmd = new SqlCommand(spName,cn))
            {
                cn.Open();
                cmd.CommandType = CommandType.StoredProcedure;

                SqlCommandBuilder.DeriveParameters(cmd);

                if (!includeReturnValueParameter)
                {
                    cmd.Parameters.RemoveAt(0);
                }

                SqlParameter[] discoveredParameters = new SqlParameter[cmd.Parameters.Count];;

                cmd.Parameters.CopyTo(discoveredParameters, 0);
                cn.Close();

                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

       
        public static void CacheParameterSet(string connectionString, string commandText, params SqlParameter[] commandParameters)
        {
            string hashKey = connectionString + ":" + commandText;

            paramCache[hashKey] = commandParameters;
        }

       
        public static SqlParameter[] GetCachedParameterSet(string connectionString, string commandText)
        {
            string hashKey = connectionString + ":" + commandText;

            SqlParameter[] cachedParameters = (SqlParameter[])paramCache[hashKey];
           
            if (cachedParameters == null)
            {           
                return null;
            }
            else
            {
                return CloneParameters(cachedParameters);
            }
        }

        #endregion caching functions

        #region Parameter Discovery Functions

       
        public static SqlParameter[] GetSpParameterSet(string connectionString, string spName)
        {
            return GetSpParameterSet(connectionString, spName, false);
        }

   
        public static SqlParameter[] GetSpParameterSet(string connectionString, string spName, bool includeReturnValueParameter)
        {
            string hashKey = connectionString + ":" + spName + (includeReturnValueParameter ? ":include ReturnValue Parameter":"");

            SqlParameter[] cachedParameters;
           
            cachedParameters = (SqlParameter[])paramCache[hashKey];

            if (cachedParameters == null)
            {           
                cachedParameters = (SqlParameter[])(paramCache[hashKey] = DiscoverSpParameterSet(connectionString, spName, includeReturnValueParameter));
            }
           
            return CloneParameters(cachedParameters);
        }

        #endregion Parameter Discovery Functions

    }



}