Using Facebook Connect auth.RevokeAuthorization in ASP.NET

Question

I'm confused as to how revoking authorization works in the ASP.NET Toolkit. I've tried issuing the following:

   ConnectSession connect = 
        new ConnectSession(FacebookHelper.ApiKey(), FacebookHelper.SecretKey());

   Auth x = new Auth(fbSession);
   x.RevokeAuthorization();

But I get an object reference error during the RevokeAuthorization call. Here's the call definition.

Any idea what I'm doing wrong?

Answer 1

Finally found a working example

   Facebook.Session.ConnectSession fbSession = 
                 new Facebook.Session.ConnectSession(ApiKey, SecretKey);
   fbSession.UserId = iFBUserID;
   fbSession.SessionKey = SessionKey;
   Api oApi = new Api(fbSession);
   oApi.Auth.RevokeAuthorization();

http://forum.developers.facebook.com/viewtopic.php?id=50938