private void btn_giam_Click(object sender, EventArgs e)
{
if (cbo_lau.SelectedIndex > -1)
{
//index = comboBox1.SelectedIndex;
//MessageBox.Show(dtchuatinh.Rows[index]["SoLuong"].ToString());
//MaNV = cls_Main.MaNV;
MaHD = mahd;
MaMon = cbo_lau.SelectedValue.ToString();
if (bd.GiamMon(ref err, MaHD, MaMon))
{
laydulieuhangdangban(MaHD);
}
}
}