private void quảnLýDanhMụcToolStripMenuItem_Click(object sender, EventArgs e)
        {
            FormDanhMuc fdm = new FormDanhMuc();

            fdm.Show();
        }
 private void quảnLýDanhMụcToolStripMenuItem_Click(object sender, EventArgs e)
 {
     FormDanhMuc fdm = new FormDanhMuc();
     fdm.Show();
 }