Why won't the ASP.NET Webform LinkButton in my MVC project invoke its code-behind OnClick event handler? - asp.net-mvc

Question

I have a previously operational webforms project I had to include in a preexistent MVC-based solution and in it there's a LinkButton control inside a form that is now only partially working; its JavaScript event handler works perfectly fine (referenced below by OnClientClick) but the C# code-behind (lnkSubmit_Click) isn't being invoked! Why not?
My LinkButton's inside Pay.aspx:
<%# Page Language="C#" AutoEventWireup="true" CodeBehind="Pay.aspx.cs" Inherits="PayUp.Pay" MasterPageFile="~/Views/Shared/Site.Master" %>
<form id="form1" runat="server" onsubmit="return validateForm();" defaultbutton="lnkSubmit" action="~/Views/Home/Pay.aspx" method="post" >
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<div align="center">
<script type="text/javascript">
window.onload = function () {
hideFields();
};
</script>
<asp:UpdatePanel runat="server" id="PendingPayments1">
<ContentTemplate>
<!-- Valid form controls, blah blah.... -->
</ContentTemplate>
</asp:UpdatePanel>
<asp:Label ID="labelPayPlan" runat="server" Text="Pay Plan">
</asp:Label>
<asp:HiddenField ID="hiddenPDFForm" Value="false" runat="server" ClientIDMode="Static" />
<asp:UpdatePanel runat="server" id="PaymentInformation1">
<ContentTemplate>
<asp:LinkButton ID="lnkSubmit" runat="server" EnableViewState="false" OnClientClick="javascript: document.getElementById('hiddenPDFForm').value = 'false';"
CssClass="button" onclick="lnkSubmit_Click" onserverclick="lnkSubmit_Click" ClientIDMode="Static">Pay Up!<img alt='Pay Up!' src='images/pay.gif' style='border:0px; margin-left:6px;' />
</asp:LinkButton>
</ContentTemplate>
</asp:UpdatePanel>
</form >
The code-behind does exist inside Pay.aspx.cs:
using System;
using System.Web;
using System.Web.UI.WebControls;
using System.Configuration;
using SupportingMVCProject;
using System.Web.Mvc;
namespace PayUp
{
public partial class Pay : System.Web.Mvc.ViewPage<SupportingMVCProject.Account>
{
protected void Page_Load(object sender, EventArgs e)
{
// The code in this event handler runs just fine when I start the project!
// This code successfully receives and correctly parses my URL parameters (QN, PN, AC).
}
protected void lnkSubmit_Click(object sender, EventArgs e)
{
// The code in this event handler never gets to run!
}
}
}
My RouteConfig.cs looks like:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Routing;
using System.Web.Http;
namespace MainMVCProject
{
public static class RouteConfig
{
public static void RegisterRoutes(RouteCollection routes)
{
routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
routes.IgnoreRoute("{WebForm}.aspx/{*pathInfo}");
routes.MapRoute("PayUpIndex", "SupportingMVCProject/PayUp",
new { controller = "PayUp", action = "Index" }
);
// Other valid preexisting MVC routes...
// blah, blah
}
}
}
The PayUpController.cs PayUpIndex route identified above looks like the following, and it does run:
public ActionResult Index(string QN, string PN, string AC)
{
string result = "";
if (!AccessValidation(PN, out result))
{
return RedirectToAction(result);
}
// blah blah
ViewData["message"] = "QN=" + QN + "PN=" + PN + "AC=" + AC;
return this.View("~/Views/PayUp/Pay.aspx");
}
My start URL is http://localhost:3835/SupportingMVCProject/PayUp?QN=ABC-1234567&PN=ABC1234567&AC=123456789. It launches the page just fine and all controls are interactive, all except my "Pay Up!" button (lnkSubmit). Why is lnkSubmit_Click inside Pay.aspx.cs not being invoked?
Your insight is greatly appreciated!

Answer 1

I am pretty sure I have read somewhere that if you use OnClientClick then server side code will not run unless you make some changes
Check out the below link
OnclientClick and OnClick is not working at the same time?