private void BtnDelete_Click(object sender, System.EventArgs e) { if (selectedCust == null) { MessageBox.Show("Please select from customer list first.", "Information", MessageBoxButtons.OK, MessageBoxIcon.Information); return; } CustomerService.CustomerService service = new CustomerService.CustomerService(); string result = service.DeleteCustomer(selectedCust.CustID); if (result != null) { MessageBox.Show(result); return; } ClearCustomer(); BtnCustList_Click(null, null); }