Server Timeout Error - asp.net

Question

I'm having problems executing a calculation procedure through an ASP.NET site to SQL Server. Not much detail, I know, but hoping someone on here can help. The procedure works in some instances and in some it does not. Here is the error message when the calculation bombs....
Server Error in '/' Application.
Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.
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.Data.SqlClient.SqlException: Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.
Source Error:
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): Timeout expired. The timeout period elapsed prior to completion of the operation or the server is not responding.]
System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) +1948826
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +4844747
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +194
System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +2392
System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) +204
System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async) +954
System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, DbAsyncResult result) +162
System.Data.SqlClient.SqlCommand.InternalExecuteNonQuery(DbAsyncResult result, String methodName, Boolean sendToPipe) +175
System.Data.SqlClient.SqlCommand.ExecuteNonQuery() +137
Database.ExportFas143CostData(Int32 PermitNameID, Int32 FiscalYear, Int32 FiscalMonth, Int32 CashFlowYear, Decimal WeightedCost) in d:\CC.NET\AROTest_web\ARO_Web\App_Code\Database.cs:1777
AroCalculations.CalculateReclamation(String ReclamationDataID, String PermitNameID) in d:\CC.NET\AROTest_web\ARO_Web\AroCalculations.aspx.cs:390
AroCalculations.CalculateSelected_Click(Object sender, EventArgs e) in d:\CC.NET\AROTest_web\ARO_Web\AroCalculations.aspx.cs:359
System.Web.UI.WebControls.LinkButton.OnClick(EventArgs e) +111
System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument) +79
System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +10
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +175
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1565
Version Information: Microsoft .NET Framework Version:2.0.50727.3053; ASP.NET Version:2.0.50727.3053

Answer 1

There are few things you can try
Increase SQLCommandTimeout
Increase HttpRuntime's Execution Time out property in web.config file, if your query takes more than request default time
Increase ScriptTimeout property
Run SQL Proffiler and optimize the SQL procedure, if it takes more time(with the help of Query Analyser and Database Tuning Adviser (DTA))