Question

Ive been using the following code for the last week and its worked no problem, then for some reason this morning its throwing:

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

My code:

DataSet icanData = (DataSet)HttpContext.Current.Session["icanDataSession"];
if (!(icanData == null))
{
     return icanData;
}

The reason I’m using HttpContext.Current.Session is because its running in a class.

Answer 1

Check session is null before cast session object to dataset

if(HttpContext.Current.Session["icanDataSession"]=!null)
{
  DataSet icanData = (DataSet)HttpContext.Current.Session["icanDataSession"];
  if (!(icanData == null))
   {
     return icanData;
   }
}
else 
{
return new Dataset();
}