Ask User To Confirm Browser Navigation

Good afternoon everyone!
I am trying to alert the user if they have unsaved data when they try to close a browser or navigate to another page.
I have written the C# and JavaScript that works when the user interacts with the browser. The problem is that the code fires when the user clicks any control on the .aspx Web page that causes a post back. I only want to alert the user when the user
clicks on the browser, not on the controls on my C# page.
JavaScript Code:
// Javascript for the main Questions.
var ss = "";
window.onload = function () {
//alert("In Window Load");
ss = document.getElementById("KevinsInput");
// This works in IE, FireFox, and Chrome.
// make IE7, IE8 compatible
var myEvent = window.attachEvent || window.addEventListener;
var chkevent = window.attachEvent ? 'onbeforeunload' : 'beforeunload';
// For >=IE7, Chrome, Firefox
myEvent(chkevent, function (e) {
if (ss.value == "1") {
ss.value = "";
} else {
ss.value = "";
var confirmationMessage = 'You have unsaved changes, are you sure you want to leave the page?';
(e || window.event).returnValue = confirmationMessage;
return confirmationMessage;
C# Code
/// <summary>
/// User clicked the button, set the Processed flag.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void Button1_Click(object sender, EventArgs e)
this.Process.Value = "1";
Thanks for your help.

Hello,
Welcome to MSDN forum.
I am afraid that the issue is out of support range of VS General Question forum which mainly discusses
the usage of Visual Studio IDE such as WPF & SL designer, Visual Studio Guidance Automation Toolkit, Developer Documentation and Help System
and Visual Studio Editor.
I suggest that you can consult your issue on ASP.NET forum:
http://forums.asp.net/ for better solution and support.
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