``` private void dgvOrder_CellClick(object sender, DataGridViewCellEventArgs e) { if (dgvOrder.SelectedRows.Count > 0) { int rowindex = e.RowIndex; //get current selected row if (rowindex > -1) { selected_order_id = dgvOrder.Rows[rowindex].Cells[1].Value.ToString(); //which RefreshGroupboxByOrderId(); } } } ```