public ActionResult Delete(int id)
        {
            var dao = new FeedBackDao();

            dao.Delete(id);
            return(RedirectToAction("Index"));
        }
        public ActionResult Delete(int id = 1)
        {
            var dao = new FeedBackDao();

            if (dao.Delete(id))
            {
                TempData["Success"] = "Xóa feedback hoàn tất";
            }
            else
            {
                TempData["Error"] = "Xóa feedback thất bại";
            }
            return(RedirectToAction("Index"));
        }