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 818:     divtype.InnerHtml = s;
Line 819:            var sg2 =(from g3 in d.Groups join g2 in d.Group2s on g3.Group2Id equals g2.Group2Id  where   g3.GroupId == Convert.ToInt32(Session["g3"])  select g2 ).FirstOrDefault();
Line 820:      a = d.Group2s.Where(id => id.Group1Id == Convert.ToInt32(sg2.Group1Id)).ToList();
Line 821: }
Line 822: 

Source File: c:\inetpub\vhosts\bigbag.co\bigbag.co\httpdocs\agahiha2.aspx.cs    Line: 820

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
   System.Data.Linq.SqlClient.QueryConverter.VisitInvocation(InvocationExpression invoke) +1250
   System.Data.Linq.SqlClient.QueryConverter.VisitInner(Expression node) +1133
   System.Data.Linq.SqlClient.QueryConverter.VisitExpression(Expression exp) +34
   System.Data.Linq.SqlClient.QueryConverter.VisitBinary(BinaryExpression b) +49
   System.Data.Linq.SqlClient.QueryConverter.VisitInner(Expression node) +460
   System.Data.Linq.SqlClient.QueryConverter.VisitExpression(Expression exp) +34
   System.Data.Linq.SqlClient.QueryConverter.VisitWhere(Expression sequence, LambdaExpression predicate) +159
   System.Data.Linq.SqlClient.QueryConverter.VisitInner(Expression node) +874
   System.Data.Linq.SqlClient.QueryConverter.ConvertOuter(Expression node) +133
   System.Data.Linq.SqlClient.SqlProvider.BuildQuery(Expression query, SqlNodeAnnotations annotations) +168
   System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query) +165
   System.Data.Linq.DataQuery`1.System.Collections.Generic.IEnumerable<T>.GetEnumerator() +55
   System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) +430
   System.Linq.Enumerable.ToList(IEnumerable`1 source) +73
   agahiha2.fillchek() in c:\inetpub\vhosts\bigbag.co\bigbag.co\httpdocs\agahiha2.aspx.cs:820
   agahiha2.Page_Load(Object sender, EventArgs e) in c:\inetpub\vhosts\bigbag.co\bigbag.co\httpdocs\agahiha2.aspx.cs:263
   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:4.8.4380.0