Server Error in '/' Application.

Object reference not set to an instance of an object.

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.NullReferenceException: Object reference not set to an instance of an object.

Source Error:


Line 16:     @foreach (var menu in listmenu)
Line 17:     {
Line 18:         string linkcate2 = Url.RouteUrl("indexbaiviet", new { title = ExpressBD.Utility.HelperSEO.ToSeoUrl(menu.CategoryName), id = menu.CategoriesNoteID });
Line 19: 
Line 20:         if (!string.IsNullOrWhiteSpace(menu.CategoryName))

Source File: c:\inetpub\wwwroot\truongdaylaixe_test\Themes\DayLaiXe_2018\Views\Shared\_Menu_BaiViet.cshtml    Line: 18

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
   ExpressBD.Utility.HelperSEO.ToSeoUrl(String url, Int32 id) +76
   ASP._Page_Themes_DayLaiXe_2018_Views_Shared__Menu_BaiViet_cshtml.Execute() in c:\inetpub\wwwroot\truongdaylaixe_test\Themes\DayLaiXe_2018\Views\Shared\_Menu_BaiViet.cshtml:18
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +254
   System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +157
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +122
   System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model, ViewDataDictionary viewData) +148
   ASP._Page_Themes_DayLaiXe_2018_Views_About_Detail_cshtml.Execute() in c:\inetpub\wwwroot\truongdaylaixe_test\Themes\DayLaiXe_2018\Views\About\Detail.cshtml:85
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +254
   System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +157
   System.Web.WebPages.StartPage.ExecutePageHierarchy() +87
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +107
   System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) +370
   System.Web.Mvc.<>c__DisplayClass1a.<InvokeActionResultWithFilters>b__17() +30
   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