Server Error in '/' Application.

Sequence contains more than one element

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 more than one element

Source Error:


Line 57:             if (id != null)
Line 58:             {
Line 59:                 aspnet_User danhmuc = db.aspnet_Users.Single(m=>m.Title_Key == id);
Line 60: 
Line 61:                 lbltieude.InnerHtml = danhmuc.Company;

Source File: c:\inetpub\vhosts\bookvieclam.com\httpdocs\forcustomer\detail.aspx.cs    Line: 59

Stack Trace:


[InvalidOperationException: Sequence contains more than one element]
   System.Data.Linq.SqlClient.SqlProvider.Execute(Expression query, QueryInfo queryInfo, IObjectReaderFactory factory, Object[] parentArgs, Object[] userArgs, ICompiledSubQuery[] subQueries, Object lastResult) +3266
   System.Data.Linq.SqlClient.SqlProvider.ExecuteAll(Expression query, QueryInfo[] queryInfos, IObjectReaderFactory factory, Object[] userArguments, ICompiledSubQuery[] subQueries) +189
   System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query) +428
   System.Data.Linq.Table`1.System.Linq.IQueryProvider.Execute(Expression expression) +51
   Detail.Page_Load(Object sender, EventArgs e) in c:\inetpub\vhosts\bookvieclam.com\httpdocs\forcustomer\detail.aspx.cs:59
   System.Web.UI.Control.OnLoad(EventArgs e) +108
   System.Web.UI.Control.LoadRecursive() +90
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1533


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4654.0