Handling Null Session variables in VB.Net

By approaching below code,we can avoid null values

Make shared function as below:

Public Shared Function Check_Session_Value_Null(ByVal session_value As HttpSessionState,ByVal key_item As String) As String

   Dim result As String = string.empty

   if session_value(key_item) <> Nothing Then
      result = session_value(key_item)
   End If

   Return result

End Function 

And call above function in any method.