Server Error in '/' Application.

Sequence contains no elements

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: Sequence contains no elements

Source Error:

The source code that generated this unhandled exception can only be shown when compiled in debug mode. To enable this, please follow one of the below steps, then request the URL:

1. Add a "Debug=true" directive at the top of the file that generated the error. Example:

  <%@ Page Language="C#" Debug="true" %>

or:

2) Add the following section to the configuration file of your application:

<configuration>
   <system.web>
       <compilation debug="true"/>
   </system.web>
</configuration>

Note that this second technique will cause all files within a given application to be compiled in debug mode. The first technique will cause only that particular file to be compiled in debug mode.

Important: Running applications in debug mode does incur a memory/performance overhead. You should make sure that an application has debugging disabled before deploying into production scenario.

Stack Trace:


[InvalidOperationException: Sequence contains no elements]
   System.Data.Linq.SqlClient.SqlProvider.Execute(Expression query, QueryInfo queryInfo, IObjectReaderFactory factory, Object[] parentArgs, Object[] userArgs, ICompiledSubQuery[] subQueries, Object lastResult) +1164
   System.Data.Linq.SqlClient.SqlProvider.ExecuteAll(Expression query, QueryInfo[] queryInfos, IObjectReaderFactory factory, Object[] userArguments, ICompiledSubQuery[] subQueries) +120
   System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query) +353
   System.Data.Linq.DataQuery`1.System.Linq.IQueryProvider.Execute(Expression expression) +54
   System.Linq.Queryable.First(IQueryable`1 source) +211
   AContext.GetCalendarEvent(Int32 nId) +450
   AContext.DoVCal() +188
   AContext.DoCommand(String sCommand, Page page, Content parent) +192
   Medc.Web.Content.ContentManager.LoadContent(Content parent) in C:\CodeMedc\Projects\Common\Source\Medc.Web\Content\ContentManager.cs:884
   Medc.Web.Content.Content.OnLoad(EventArgs e) in C:\CodeMedc\Projects\Common\Source\Medc.Web\Content\Content.cs:48
   System.Web.UI.Control.LoadRecursive() +130
   System.Web.UI.Control.LoadRecursive() +200
   System.Web.UI.Control.LoadRecursive() +200
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2857


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4690.0