stop back button after logout in asp.net c#

Design a login page, give user name and password then redirect to some other page which is a content page of a Master page. In this master page one link button should be present for logout. When you click on the logout button it redirects to the login page. Then when you click on the back arrow of the browser it again goes to the previous page (that you already visit before logout). Even if you write code for session clear in logout button click event still it goes to previous page. To avoid this write few lines of code in Page_Init method of master page.
  protected void Page_Init(object sender, EventArgs e)
{
      Response.Cache.SetExpires(DateTime.UtcNow.AddMinutes(-1));
      Response.Cache.SetCacheability(HttpCacheability.NoCache);
      Response.Cache.SetNoStore();
}