Unfortunately, this message "Session state can only be used..." is NOT ALWAYS APPROPRIATE i.e. it can be displayed even if your "EnableSessionS tate" setting is positive { by the way, the shortest setting Works!}
Then, never forget the most stupid things: - The Interval Life time of "Session".
If you use Global.asax file in your site :
- Methods Session_Start() and Session_End() will delimit the "Session"...