public ActionResult Category(int?page, int machude)
        {
            int pagesize    = 9;
            var pagecurrent = (page ?? 1);

            var dao = new ChuDeDao();

            IQueryable <Sach> model = dao.ListAllPaging(machude);

            return(View("Category", model.ToPagedList(pagecurrent, pagesize)));
        }
        // GET: Admin/ChuDeAD

        public ActionResult Index(string searchString, int page = 1, int pageSize = 10)
        {
            if (Session["User"] == null)
            {
                return(RedirectToAction("Login", "Login"));
            }
            else
            {
                var dao = new ChuDeDao();
                ViewBag.SearchString = searchString;
                var model = dao.ListAllPaging(searchString, page, pageSize);
                return(View(model));
            }
        }