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:


Line 19:             else
Line 20:             {
Line 21:                 var item = _db.tblLichCongTacs.Single(r=>r.ID==Utilities._GetID_Request(Request.QueryString["id"]));
Line 22:                 title = item.Title;
Line 23:                 url = System.Configuration.ConfigurationManager.AppSettings["domain"] + item._file;

Source File: c:\inetpub\wwwroot\WebChuPah\UserPages\Calenda.aspx.cs    Line: 21

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) +3121
   System.Data.Linq.SqlClient.SqlProvider.ExecuteAll(Expression query, QueryInfo[] queryInfos, IObjectReaderFactory factory, Object[] userArguments, ICompiledSubQuery[] subQueries) +187
   System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query) +410
   System.Data.Linq.Table`1.System.Linq.IQueryProvider.Execute(Expression expression) +48
   UserPages_Calenda.Page_Load(Object sender, EventArgs e) in c:\inetpub\wwwroot\WebChuPah\UserPages\Calenda.aspx.cs:21
   System.Web.UI.Control.OnLoad(EventArgs e) +106
   System.Web.UI.Control.LoadRecursive() +68
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3785


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.4087.0