private void updateButton_Click(object sender, EventArgs e) { dealer.DealerName = nameTextBox.Text; dealer.DealerCompanyName = cNameTextBox.Text; dealer.Contact = contactTextBox.Text; dealer.Address = addressTextBox.Text; dealer.City = cityTextBox.Text; if (_dealerManager.Update(dealer, id)) { MessageBox.Show("Updated"); List <Dealer> dealers = _dealerManager.Display(); showDataGridView.DataSource = dealers; return; } else { MessageBox.Show("Not Updated"); } }