private void btnDelete_Click(object sender, EventArgs e) { if (detail.SalesID == 0) { MessageBox.Show("Please select a sales from table"); } else { DialogResult result = MessageBox.Show("Are you sure?", "Warning!!", MessageBoxButtons.YesNo); if (result == DialogResult.Yes) { if (bll.Delete(detail)) { MessageBox.Show("Sales was deleted"); bll = new SalesBLL(); dto = bll.Select(); dataGridView1.DataSource = dto.Sales; CleanFilters(); } } } }