private void btnLuu_Click(object sender, EventArgs e)
{
SuDung.MaDV = cboDichVu.SelectedValue.ToString();
SuDung.MaHD = txtHoaDon.Text;
SuDung.ThoiGian = DateTime.Now;
DichVuDAO DichVuDAO = new DichVuDAO();
SuDung.Gia = DichVuDAO.GetGia(cboDichVu.SelectedValue.ToString());
DAL_SuDung.addSuDung(SuDung);
dgvDanhSach.DataSource = DAL_SuDung.getDanhSach();
_them = false;
btnLuu.Enabled = false;
btnThem.Enabled = true;
btnXoa.Enabled = true;
timer1.Enabled = true;
cboPhong.Enabled = false;
cboDichVu.Enabled = false;
}
