How To Explicitly Allocate An Sql Server Connection From The Connections Pool

Feb 21, 2008

Hello.

I have a db dal containing the following code:


SqlCommand cmd = new SqlCommand();

cmd.Connection = dbc;

cmd.CommandType = CommandType.StoredProcedure;

cmd.CommandText = "SOME STORED PROCEDURE";
.
.
.
declare some SqlParameters
.
.
.



dbc.Open();

cmd.ExecuteNonQuery();

dbc.Close();

This code, when concurrently running via several threads, yields the following exception:
"The connection was not closed. The connection's current state is open."


My questions are:
1. Why don't .Net allocate another connection from the pool (I try to only concurrently run 2 threads while there are 25 connections in the connection pool) ?
2. How can one explicitly allocate a connection?
3. How do you suggest to solve this problem without a mutex/monitor etc' on the 3 bold lines above and without BeginExequteNonQuery()?







Thank you !






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Hi

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Hi guys!
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**
    Looking at performance counters:  _global_
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**

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HI,

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error:
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Regrads
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Sep 6, 2007

Halo all
 
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Then i explore and found out that i did not close my SqlDataReader, SqlDataAdapter, SqlCommand or my connection.
 
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Hi to all,

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And now strange thing is happening ,, I am receiving error :

Timeout expired. The timeout period elapsed prior to obtaining a connection
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My site works fine in VWD2008 express, but I get this error when I try to use it on my live website.
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1.
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This is my code...
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{SqlDatabase database = (SqlDatabase)DatabaseFactory.CreateDatabase("ConnectionString");DbCommand command = database.GetSqlStringCommand("SELECT UserName FROM Users WHERE UserID = '6264'");
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This is my error:
Server Error in '/' Application.


Timeout expired.  The timeout period elapsed prior to obtaining a connection from the pool.  This may have occurred because all pooled connections were in use and max pool size was reached.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.InvalidOperationException: Timeout expired.  The timeout period elapsed prior to obtaining a connection from the pool.  This may have occurred because all pooled connections were in use and max pool size was reached.Source Error:



Line 21: //DbCommand command = database.GetStoredProcCommand("CorrUsers_GetByUserId_s");
Line 22: DbCommand command = database.GetSqlStringCommand("SELECT UserName FROM Users WHERE UserID = '6264'");
Line 23: database.ExecuteReader(command);
Line 24: using (IDataReader reader = database.ExecuteReader(command))
Line 25: {Source File: d:webwwwrootchacha078dev.cha.toplingo.com est.aspx.cs    Line: 23 Stack Trace:



[InvalidOperationException: Timeout expired. The timeout period elapsed prior to obtaining a connection from the pool. This may have occurred because all pooled connections were in use and max pool size was reached.]
System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +1261381
System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +105
System.Data.SqlClient.SqlConnection.Open() +111
Microsoft.Practices.EnterpriseLibrary.Data.Database.GetNewOpenConnection() +195
Microsoft.Practices.EnterpriseLibrary.Data.Database.GetOpenConnection(Boolean disposeInnerConnection) +106
Microsoft.Practices.EnterpriseLibrary.Data.Database.ExecuteReader(DbCommand command) +62
test.Page_Load(Object sender, EventArgs e) in d:webwwwrootchacha078dev.cha.toplingo.com est.aspx.cs:23
System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +15
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System.Web.UI.Control.LoadRecursive() +47
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1436

Any help with this matter would be very much appreciated.
 Thank you for your time.
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An error has occurred while establishing a connection to the server.  When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)
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An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace:



[SqlException (0x80131904): An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)]
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System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +188
System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, SqlConnection owningObject) +685966
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System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) +181
System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) +170
System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) +130
System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options) +28
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System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject) +66
System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) +496
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System.Web.UI.WebControls.WebParts.WebPartPersonalization.Load() +105
System.Web.UI.WebControls.WebParts.WebPartManager.OnInit(EventArgs e) +497
System.Web.UI.Control.InitRecursive(Control namingContainer) +321
System.Web.UI.Control.InitRecursive(Control namingContainer) +198
System.Web.UI.Control.InitRecursive(Control namingContainer) +198
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System.Web.UI.Control.InitRecursive(Control namingContainer) +198
System.Web.UI.Control.InitRecursive(Control namingContainer) +198
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +692



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using System;
using System.Data;
using System.Data.SqlClient;namespace Chapter6
{
class CallSp1
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SqlDataReader rdr = cmd.ExecuteReader();
// process the result setwhile (rdr.Read())
{Console.WriteLine("{0} {1} {2}",rdr[0].ToString().PadRight(5),rdr[1].ToString(),rdr[2].ToString());
}
rdr.Close();
}catch (SqlException ex)
{Console.WriteLine(ex.ToString());
}
finally
{
conn.Close();
}
}
}
}
 
The build indicates no errors but the dos output gives the following error:
 
 Error: System.Data.SqlClient.SqlException: An error has occurred while establishing a connection to the server.  When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does notallow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)   at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection)   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj)   at System.Data.SqlClient.TdsParser.Connect(Boolean& useFailoverPartner, Boolean& failoverDemandDone, String host, String failoverPartner, String protocol, SqlInternalConnectionTds connHandler, Int64 timerExpire, Boolean encrypt, BooleantrustServerCert, Boolean integratedSecurity, SqlConnection owningObject, Boolean aliasLookup)   at System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance)   at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance)   at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection)   at System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options)   at System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject)   at System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject)   at System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject)   at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection)   at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory)   at System.Data.SqlClient.SqlConnection.Open()   at Chapter10.ConnectionSql.Main(String[] args) in D:PROG_DEVVb.NET_devConsoleAppconnectVerifyAppconnectVerifyAppProgram.cs:line 18Connection closed.Press any key to continue . . .
BOTH THE CLENT AND DATABASE IS ON SAME MACHINE.
THE DATABSE IS centrinosqlexpress as shown in the code.
I
 
 
 

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