private void contextMenuStrip1_Click(object sender, EventArgs e)
        {
            frmChitiethoadonBan fr = new frmChitiethoadonBan();

            fr.mahoadon = dataGridView1DSDSThu.CurrentRow.Cells[1].Value.ToString();
            fr.ShowDialog();
        }
        private void chiTiếtPhiếuXuấtToolStripMenuItem_Click(object sender, EventArgs e)
        {
            frmChitiethoadonBan fr = new frmChitiethoadonBan();

            fr.ShowDialog();
        }