private void thànhViênNhómToolStripMenuItem_Click(object sender, EventArgs e)
        {
            FormThongTin ftn = new FormThongTin();

            ftn.Show();
        }
 private void thànhViênNhómToolStripMenuItem_Click(object sender, EventArgs e)
 {
     FormThongTin ftn = new FormThongTin();
     ftn.Show();
 }