private void btnInhoadon_Click(object sender, EventArgs e)
        {
            if (dataGridView2.SelectedRows.Count == 0)
            {
                return;
            }
            string        maHD = dataGridView2.Rows[dataGridView2.CurrentCell.RowIndex].Cells[1].Value.ToString();
            fBaoCaoHoaDon fm   = new fBaoCaoHoaDon();

            if (dataGridView2.SelectedRows.Count == 1)
            {
                fm.funData = maHD;
            }
            else
            {
                List <string> lst = new List <string>();
                foreach (DataGridViewRow item in dataGridView2.Rows)
                {
                    if (item.Selected)
                    {
                        lst.Add(item.Cells[1].Value.ToString());
                    }
                }
                fm.LISTMAHD = lst;
            }
            fm.ShowDialog();
            fm.FormBorderStyle = System.Windows.Forms.FormBorderStyle.Sizable;
            fm.EnableInhoadon(true);
        }