Code for logout button?

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ASP.NET

Hi,

I place Logout button in my web form. The user clicks the logout button that sends him to the login page. I'm using code like:

Session["username"] == null;
Session.Abandon();
Response.Redirect("login.aspx");

In this code I Redirect to the login page, but my problem is when I click the back arrow button of the browser it goes to the previous pages.

Please give a solution for only displaying a login page after clicking the logout button when i click the back arrow button of browser, and not going to any another pages.

Thanks.