Log out using forms authentication in SP2010

I have configured an intranet using Claims based authentication and an extended internet site using forms based authentication in SP 2010

All is set up and working except logging out...

I have a loginstatus control which I have placed a linkbutton inside the loggedin template. When I click the button to log out, I have used:

 Session.Abandon();
        Response.Cookies.Clear();
        FormsAuthentication.SignOut();

And a custo开发者_运维百科m redirect. ~However when I get redirected back to my home page the system still says that Im logged in and I navigate around the site. How else do I force a logout?

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See this post by Sanjay Bhagia

loginStatus.LoggingOut += new LoginCancelEventHandler(loginStatus_LoggingOut);

and in logout event, i used this code to logout the user.

FederatedAuthentication.SessionAuthenticationModule.SignOut();
//WSFederationAuthenticationModule.FederatedSignOut();
WSFederationAuthenticationModule authModule = FederatedAuthentication.WSFederationAuthenticationModule;
SPUtility.Redirect(WSFederationAuthenticationModule.GetFederationPassiveSignOutUrl(authModule.Issuer, authModule.Realm, null), SPRedirectFlags.Default, HttpContext.Current);

as, with Claims, user is not authenticated with FormsAuthentication anymore rather with Federated Authentication, so we need to sign out this user from Federation. This piece of code worked for me!