Server Error in '/' Application.

Cannot perform runtime binding on a null reference

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: Microsoft.CSharp.RuntimeBinder.RuntimeBinderException: Cannot perform runtime binding on a null reference

Source Error:


Line 37: 
Line 38:     var row = db.QuerySingle(selectQueryString, sId.ToString());
Line 39:     var sclass_main = @row.class_main.ToString();
Line 40:     var sclass_main_d = sclass_main + "d";
Line 41: 

Source File: h:\root\home\mohamedselim2020-001\www\site1\details.cshtml    Line: 39

Stack Trace:


[RuntimeBinderException: Cannot perform runtime binding on a null reference]
   CallSite.Target(Closure , CallSite , Object ) +115
   System.Dynamic.UpdateDelegates.UpdateAndExecute1(CallSite site, T0 arg0) +257
   CallSite.Target(Closure , CallSite , Object ) +223
   ASP._Page_details_cshtml.Execute() in h:\root\home\mohamedselim2020-001\www\site1\details.cshtml:39
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +198
   System.Web.WebPages.WebPage.ExecutePageHierarchy(IEnumerable`1 executors) +69
   System.Web.WebPages.WebPage.ExecutePageHierarchy() +131
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +78
   System.Web.WebPages.WebPageHttpHandler.ProcessRequestInternal(HttpContextBase httpContext) +116


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4700.0