.Net LINQ to SQL Exception

I'm using C# , .NET and SQL Server with Linq2SQL.

What does this error mean?

Is it a insert or read/select related error?

The function Classes.BLL.Save(LPage l) first selects COUNT from database and then INSERT a new record to database.

2010-09-03 04:57:56,264 System.Data.SqlClient.SqlException (0x80131904): Timeout expired.  The timeout period elapsed prior to completion of the operation or the server is not responding.
   at System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection)
   at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection)
   at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning()
   at System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj)
   at System.Data.SqlClient.SqlDataReader.ConsumeMetaData()
   at System.Data.SqlClient.SqlDataReader.get_MetaData()
   at System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString)
   at System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async)
   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result)
   at System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method)
   at System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method)
   at System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior)
   at System.Data.Common.DbCommand.ExecuteReader()
   at System.Data.Linq.SqlClient.SqlProvider.Execute(Expres开发者_运维技巧sion query, QueryInfo queryInfo, IObjectReaderFactory factory, Object[] parentArgs, Object[] userArgs, ICompiledSubQuery[] subQueries, Object lastResult)
   at System.Data.Linq.SqlClient.SqlProvider.ExecuteAll(Expression query, QueryInfo[] queryInfos, IObjectReaderFactory factory, Object[] userArguments, ICompiledSubQuery[] subQueries)
   at System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query)
   at System.Data.Linq.ChangeDirector.StandardChangeDirector.DynamicInsert(TrackedObject item)
   at System.Data.Linq.ChangeDirector.StandardChangeDirector.Insert(TrackedObject item)
   at System.Data.Linq.ChangeProcessor.SubmitChanges(ConflictMode failureMode)
   at System.Data.Linq.DataContext.SubmitChanges(ConflictMode failureMode)
   at Classes.BLL.Save(LPage l)

Update:

I know this is a timeout exception and its coming from the sql server. but the error says two things ,

1) error in Common.DbCommand.ExecuteReader() and

2) error in DataContext.SubmitChanges(ConflictMode failureMode) ,

So I'm trying to find out if the source of the error is the select command or the insert command.

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This error is coming from SQL Server and not Linq. It simply means the operation with SQL Server didn't respond within your designated time-out period (probably 30 seconds). This could be due to waiting on a lock being released on more or more records, or some other resource contention.

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It's a select error - Insert queries would be done via ExecuteNonQuery if I remember right. Although, this error would probably appear in another way or form for Insert as well. It isn't caused by Linq but by the Sql Server though.

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"Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding."

So it's probaly a timeout. Can you ping the sql server host? Did you try to create an UDL file and test your connection with that? (Right click in a folder, create a new empty text file, rename it to test.udl, double click to open and fill in the necessary connection data, then click test)

kind regards,

Karel