private void xemTồnKhoToolStripMenuItem_Click(object sender, EventArgs e)
        {
            FormXemTonKho fxtk = new FormXemTonKho();

            fxtk.Show();
        }
 private void xemTồnKhoToolStripMenuItem_Click(object sender, EventArgs e)
 {
     FormXemTonKho fxtk = new FormXemTonKho();
     fxtk.Show();
 }