protected void BtnCancel_Click(object sender, EventArgs e) { string confirmValue = Request.Form["confirm_value"]; if (confirmValue == "Yes") { List <OrderListDetail> OrderListDetail = (List <OrderListDetail>)Session["OrderListDetail"]; string orderid = OrderListDetail[0].Order_ID; bool flag = POC.CancelPurchaseOrder(orderid, txtRemark.Text); if (flag == true) { Page.ClientScript.RegisterStartupScript(this.GetType(), "script", "<script>alert('Cancel Success!')</script>"); PanelOrderDetail.Visible = false; PostBack(); } else { Page.ClientScript.RegisterStartupScript(this.GetType(), "script", "<script>alert('Cancel failed!')</script>"); } //Add pop window to show success } }