Set authorization for a whole area

public class FilterConfig
{
    public static void RegisterGlobalFilters(GlobalFilterCollection filters)
    {
        filters.Add(new CustomAuthorizeAttribute());
        filters.Add(new HandleErrorAttribute());
    }
}

public class CustomAuthorizeAttribute : AuthorizeAttribute
{
    protected override bool AuthorizeCore(HttpContextBase httpContext)
    {
        var routeData = httpContext.Request.RequestContext.RouteData;
        var controller = routeData.GetRequiredString("controller");
        var action = routeData.GetRequiredString("action");
        var area = routeData.DataTokens["area"];
        var user = httpContext.User;
        if (area != null && area.ToString() == "Customer")
        {
            if (!user.Identity.IsAuthenticated)
                return false;
        }
        else if (area != null && area.ToString() == "Admin")
        {
            if (!user.Identity.IsAuthenticated)
                return false;
            if (!user.IsInRole("Admin"))
                return false;
        }
        return true;
    }
}