protected void btnDelete_Click(object sender, ImageClickEventArgs e) { try { ctBUS = new CustomerBUS(); dtgBUS = new DetailGroupBUS(); int CustomerID = int.Parse(((ImageButton)sender).CommandArgument.ToString()); ConnectionData.OpenMyConnection(); ctBUS.tblCustomer_Delete(CustomerID); dtgBUS.tblDetailGroup_DeleteByCustomerID(CustomerID); pnError.Visible = false; pnSuccess.Visible = true; lblSuccess.Text = "Xóa thành công một khách hàng ID: " + CustomerID.ToString(); LoadCustomer(); ConnectionData.CloseMyConnection(); } catch (Exception ex) { logs.Error(userLogin.Username + "-Client - btnDelete_Click", ex); pnSuccess.Visible = false; pnError.Visible = true; lblError.Text = ex.Message; } }