private void DataGV_CellClick(object sender, DataGridViewCellEventArgs e) { if (DataGV.SelectedRows[0].Cells[e.ColumnIndex].OwningColumn.Name == "Rules") { DiscountRulesList form = new DiscountRulesList(Convert.ToInt32(DataGV.SelectedRows[0].Cells["ID"].Value)); form.ShowDialog(); } }