public async void StartLogin( ) { FBSession s = FBSession.ActiveSession; // Assumes the Facebook App ID and Windows Phone Store ID have been // saved in the default resource file. ResourceLoader rl = ResourceLoader.GetForCurrentView(); String appId = rl.GetString(FBAppIDName); String winAppId = rl.GetString(FBPhoneAppIDName); // IDs are both sent to FB app, so it can validate us. s.FBAppId = appId; s.WinAppId = winAppId; // These are the default permissions, needed to retrieve user info. s.AddPermission("public_profile"); s.AddPermission("user_friends"); s.AddPermission("user_likes"); // Launches a URI to redirect to the FB app, which will log us in // and return the result via our registered protocol. await s.LoginAndContinue(); }