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 98:         {
Line 99:             //  id = RouteData.Values["id"].ToString();
Line 100:              Course = RouteData.Values["Lession"].ToString();
Line 101:            id = RouteData.Values["Subject"].ToString();
Line 102:        }

Source File: c:\inetpub\vhosts\edutry.com\httpdocs\Studymaterial.aspx.cs    Line: 100

Stack Trace:


[NullReferenceException: Object reference not set to an instance of an object.]
   Studymaterial.bindassignementall() in c:\inetpub\vhosts\edutry.com\httpdocs\Studymaterial.aspx.cs:100
   Studymaterial.Page_Load(Object sender, EventArgs e) in c:\inetpub\vhosts\edutry.com\httpdocs\Studymaterial.aspx.cs:33
   System.Web.UI.Control.OnLoad(EventArgs e) +105
   System.Web.UI.Control.LoadRecursive() +67
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3784


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.3930.0