Get The Route When Unauthenticated / Logout With Mvc?

I have this piece of code:

public class Authenticate : ActionFilterAttribute
{
public override void OnActionExecuting(ActionExecutingContext filterContext)
{
if (!filterContext.HttpContext.User.Identity.IsAuthenticated)
{
filterContext.HttpContext.Response.Redirect("/");
}
}
}

I was wondering if it is possible to make it redirect to the view for action="Login" controller="AdminLogin"? And how do I pass some message to the login view that tells "you need to login to access that" or similar?