private void câpNhâtTrinhĐôToolStripMenuItem_Click(object sender, EventArgs e)
        {
            TrinhDo td = new TrinhDo();

            td.Show();
        }
 private void câpNhâtTrinhĐôToolStripMenuItem_Click(object sender, EventArgs e)
 {
     TrinhDo td = new TrinhDo();
     td.Show();
 }