public ActionResult TuyenSinh1(string mabaidang)
        {
            var dao = new TT_TS();
            var res = dao.baidang_nd(mabaidang);

            ViewBag.List = dao.baidang_file(mabaidang);
            if (res == null)
            {
                return(View(new BaidangViewModel()));
            }
            return(View(res));
        }