On session Timeout My page is not getting refreshed - MVC 4

I have already set the session time in web.Config file, after the session time out I want my page automatically to get refreshed and redirect to Login page, but its not happening, kindly find my code as mentioned below :- Pleaes help me , I have been trying since almost 1 week, but no progress.

HttpContext ctx = HttpContext.Current;

if (ctx.Session != null)

{

// check if a new session id was generated

if (ctx.Session.IsNewSession)

{

HttpContext ctx1 = HttpContext.Current;

// check sessions here

if (ctx.Session["UserName"] == null || !filterContext.HttpContext.Request.IsAuthenticated)

{

if (filterContext.HttpContext.Request.IsAjaxRequest())

{

FormsAuthentication.SignOut();

filterContext.Result = new RedirectResult("~/Authentication/Logon");

base.OnActionExecuting(filterContext);

}

}

}

}