private void contextMenuStrip2_Click(object sender, EventArgs e)
        {
            frmChitiethoadonMua fr = new frmChitiethoadonMua();

            fr.mahoadon = dataGridView1DS2.CurrentRow.Cells[1].Value.ToString();
            fr.ShowDialog();
        }
        private void chiTiếtPhiếuNhậpToolStripMenuItem_Click(object sender, EventArgs e)
        {
            frmChitiethoadonMua fr = new frmChitiethoadonMua();

            fr.ShowDialog();
        }