public bool UpdateSinhVien(string sbd, string hodem, string ten, DateTime ngaysinh, string gioitinh, string tenhuyen, string tentinh, string doituong, string dantoc, double toan, double ly, double hoa, double sinh, double van, double su, double dia, double anhvan)
        {
            ValueHoSoThiSinh obj = new ValueHoSoThiSinh(sbd, hodem, ten, ngaysinh, gioitinh, tenhuyen, tentinh, doituong, dantoc, toan, ly, hoa, sinh, van, su, dia, anhvan);

            context.setState(new UpdateState());
            return(context.doAction(obj));
        }
        public bool DeleteSinhVien(string sbd)
        {
            ValueHoSoThiSinh obj = new ValueHoSoThiSinh(sbd);

            context.setState(new DeleteState());
            return(context.doAction(obj));
        }