public static int ThemBoDeThi(DETHIDTO d)
        {
            DETHIDAO dao = new DETHIDAO();

            return(dao.ThemBoDeThi(d));
        }
        public static bool CapNhatBoDeThi(DETHIDTO d)
        {
            DETHIDAO dao = new DETHIDAO();

            return(dao.CapNhatBoDeThi(d));
        }
        public static List <DETHIDTO> LayDanhSachBoDeThi()
        {
            DETHIDAO d = new DETHIDAO();

            return(d.LayDanhSachBoDeThi());
        }