private void xemĐơnHàngToolStripMenuItem_Click(object sender, EventArgs e)
        {
            FormQLDonHang qldh = new FormQLDonHang();

            qldh.Show();
        }
 private void xemĐơnHàngToolStripMenuItem_Click(object sender, EventArgs e)
 {
     FormQLDonHang qldh = new FormQLDonHang();
     qldh.Show();
 }