asp.net handling Back button event after Logout

Question

In the logout link button click event I have cleared the session variables. I am checking these session variables for null values at each page's load event. If it has the null value redirecting them to the login page. But the problem is whenever I click the browser back button, the page_load event won't get called. For that I have cleared the the browser cache history. Please help me someone where I am missing...

Answer 1

You will need to make sure the pages behind the login (those that can only be accessed after login) are not cached in the browser:

Page.Response.Cache.SetCacheability(HttpCacheability.NoCache);

If using forms authentication, you will also need to abandon the session and logout:

Session.Abandon();
FormsAuthentication.SignOut();

See this, this and this.