NullReferenceException was unhandled by user code

Question

I am getting this type error. So help me to solve my problem

Manav Pandya · Accepted Answer

Hello   I think session key does not have value at page load time thats why its returns exception   and you have used ToString() also , so try by implementing as below : string  MySession= Session[ "your key value" ]  as   string ;      // Than check either its empty or not    if ( string .IsNullOrEmpty(MySession))   {          // Do as requirement    }   OR  if  (Session[ "Your key value" ] !=  null )   {            // Than and than only you should assign value to variable            string  username = Session[ "Your key value" ].toString();   }    Thanks

Dharmraj Thakur · Answer

You should use like this: string  s = String.Empty;   if ( HttpContext.Session[ "i" ] != null  && ! string .IsNullOrEmpty(Convert.ToString(HttpContext.Session[ "i" ])) )   {   s = Convert.ToString(HttpContext.Session[ "i" ]);   }