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 262:            //stt++;
Line 263:                    <tr>
Line 264:                        <td style="text-align: left;/*color:#1832fc*/"> @WebCT.Models.Lophoc.laytenlophoc(Convert.ToInt32(i.idlophoc))</td>
Line 265:                        <td style="text-align: left">@WebCT.Models.Monhoc.laytenmonhoc(Convert.ToInt32(i.idmonhoc))</td>
Line 266:                        <td style="text-align: left;color:#1832fc">@Html.Raw(i.noidungkq)</td>

Source File: c:\www\vhosts\truongchinhtritq.edu.vn\httpdocs\Views\KetquaHTPhiaNgoai\Index.cshtml    Line: 264

Stack Trace:


[InvalidOperationException: Sequence contains no elements]
   System.Linq.Enumerable.First(IEnumerable`1 source) +417
   WebCT.Models.Lophoc.laytenlophoc(Int32 idlophoc) +388
   ASP._Page_Views_KetquaHTPhiaNgoai_Index_cshtml.Execute() in c:\www\vhosts\truongchinhtritq.edu.vn\httpdocs\Views\KetquaHTPhiaNgoai\Index.cshtml:264
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +255
   System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +158
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +108
   System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) +371
   System.Web.Mvc.<>c__DisplayClass1a.<InvokeActionResultWithFilters>b__17() +31
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) +434
   System.Web.Mvc.Async.<>c__DisplayClass25.<BeginInvokeAction>b__22(IAsyncResult asyncResult) +189
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +53
   System.Web.Mvc.<>c__DisplayClass1d.<BeginExecuteCore>b__18(IAsyncResult asyncResult) +27
   System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +25
   System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +67
   System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +25
   System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +53
   System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__3(IAsyncResult asyncResult) +41
   System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +25
   System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +53
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +431
   System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +75
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +158


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4110.0