C# Cannot check Session exists?

Question

I get an error when I do the following:

if(Session[\"value\"] != null)
{
   // code
}

The error i get is this:

Object reference not

Answer 1

You also can use:

if (Session == null || String.IsNullOrEmpty((string)Session["session_object"])){
   // Do something
}

Answer 2

I solve by this way:

if (Session.Count > 0 && Session["mySessionVariable"].ToString() != null)
{

}