Back Button Issue after LogOff in .Net mvc

If User donot want to remove the cache at each web page  in the entire application and don't want to go back after logoff the system, then the following code will be good enough:

public ActionResult LogOff()
    {

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

        // clear authentication cookie
        HttpCookie cookie1 = new HttpCookie(FormsAuthentication.FormsCookieName, "");
        cookie1.Expires = DateTime.Now.AddYears(-1);
        Response.Cookies.Add(cookie1);

        // clear session cookie (not necessary for your current problem but i would recommend you do it anyway)
        HttpCookie cookie2 = new HttpCookie("ASP.NET_SessionId", "");
        cookie2.Expires = DateTime.Now.AddYears(-1);
        Response.Cookies.Add(cookie2);

        // Invalidate the Cache on the Client Side
        Response.Cache.SetCacheability(HttpCacheability.NoCache);
        Response.Cache.SetExpires(DateTime.UtcNow.AddMinutes(-1));
        Response.Cache.SetNoStore();

        Response.AppendHeader("Pragma", "no-cache");

        // send an expired cookie back to the browser
        var ticketExpiration = DateTime.Now.AddDays(-7);
        var ticket = new FormsAuthenticationTicket(
            1,
            // replace with username if this is the wrong cookie name
            FormsAuthentication.FormsCookieName,
            DateTime.Now,
            ticketExpiration,
            false,
            String.Empty);
        var cookie = new System.Web.HttpCookie("user")
        {
            Expires = ticketExpiration,
            Value = FormsAuthentication.Encrypt(ticket),
            HttpOnly = true
        };

        Response.Cookies.Add(cookie);

        return RedirectToAction("Login", "Account");
    }


If User wants to remove caching the entire application, then the following code will be applied in the Global.asax.cs file:
protected void Application_BeginRequest()
{
    Response.Cache.SetCacheability(HttpCacheability.NoCache);
    Response.Cache.SetExpires(DateTime.UtcNow.AddHours(-1));
    Response.Cache.SetNoStore();
}