private void chiTiếtXuấtToolStripMenuItem_Click(object sender, EventArgs e)
 {
     frm_CTXuat ctx = new frm_CTXuat();
     ctx.ShowDialog();
 }
        private void chiTiếtXuấtToolStripMenuItem_Click(object sender, EventArgs e)
        {
            frm_CTXuat ctx = new frm_CTXuat();

            ctx.ShowDialog();
        }