// GET: Admin/TinTuc/AllTin
        public ActionResult AllSlide(string tukhoa, int page = 1, int pageSize = 20)
        {
            var dao   = new SlideDAO();
            var model = dao.DsSlide(tukhoa, page, pageSize);

            ViewBag.TuKhoa = tukhoa;
            return(View(model));
        }