public ActionResult List(string url)
        {
            var list = UserListRepository.Instance.FindUserList(url);
            var model = new UserListViewModel(list);

            return View(model);
        }
        public ActionResult GetList(int userListId)
        {
            var list = UserListRepository.Instance.FindUserList(userListId);
            var model = new UserListViewModel(list);

            return new JsonResult() { Data = model };
        }