public static void SetCookie(string cookieName, string val, DateTime expires)
        {
            var cookie = HttpContext.Current.Request.Cookies[cookieName] ?? new HttpCookie(cookieName);
            cookie.Expires = expires;
            cookie.Value = val;
            HttpContext.Current.Response.Cookies.Set(cookie);
        }

        public static string GetCookie(string cookieName)
        {
            var cookie = HttpContext.Current.Request.Cookies[cookieName];
            if (cookie == null)
                return string.Empty;
            var val = cookie.Value;
            return val;
        }