private void cboMaKh_SelectedIndexChanged(object sender, EventArgs e)
{
if (cboMaKh.SelectedIndex == -1)
{
return;
}
px.MaKh = int.Parse(cboMaKh.Text);
cboTenKh.DataSource = pxbll.ShowTenKhTheoMaKn(px);
}
