private void button5_Click_1(object sender, EventArgs e)
{
bd.TinhTien(ref err, mahd);
//taoMaHoaDon();
reportprinthoadon inhd = new reportprinthoadon(mahd);
inhd.ShowDialog();
cbo_khuA.SelectedIndex = -1;
cbo_KhuB.SelectedIndex = -1;
cbo_KhuC.SelectedIndex = -1;
mahd = "";
lbl_MaHD.Text = "Mã HD: ";
banopen();
dgvdshangdangban.Visible = false;
menuclose();
laydulieuhangdangban(mahd);
btn_lammoi.Enabled = true;
btn_chon.Enabled = true;
layhoadonchuatinhtien();
banlose();
}