private void câpNhâtHơpĐôngToolStripMenuItem_Click(object sender, EventArgs e)
        {
            HopDong hd = new HopDong();

            hd.Show();
        }
 private void câpNhâtHơpĐôngToolStripMenuItem_Click(object sender, EventArgs e)
 {
     HopDong hd = new HopDong();
     hd.Show();
 }