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The system should monitor user activity and it should start the countdown only if it sees that the user is not doing anything say for 3 mins or 5 mins
And when the countdown is running lets say for 1 hour and user clicks inside the page and does some action, then the countdown should reset to 2 hour and it should not start the countdown until it again detects user inaction for 3 or 5 mins
If there is user inaction for 3 or 5 mins and the countdown starts and runs till 1:58 mins and still there is no user action, then the popup with 2 min countdown should appear with "Extend Session" button
With “Extend Session” button click the counter should be reset to 2 hours and again it should not start the countdown until it detects user inaction for 3 or 5 mins

What I have tried:

    <form id="form1" runat="server">
        Session Idle: <span id="secondsIdle"></span> seconds.</h3>
    <div id="dialog">
        Your Session will expire in <span id="seconds"></span> seconds.<br />
        Do you want to reset?
    <script type="text/javascript" src=""></script>
    <script src="" type="text/javascript"></script>
    <link href=""
        rel="stylesheet" type="text/css" />
    <script type="text/javascript">
        $(function () {
                autoOpen: false,
                modal: true,
                title: "Session Expiring",
                buttons: {
                    Ok: function () {
                    Close: function () {
        function SessionExpireAlert(timeout) {
            var seconds = timeout / 1000;
            setInterval(function () {
            }, 1000);
            setTimeout(function () {
                //Show Popup before 20 seconds of timeout.
            }, timeout - 30 * 1000);
            setTimeout(function () {
                window.location = "User/SessionExpired";
            }, timeout);
        function ResetSession() {
            //Redirect to refresh Session.
            window.location = window.location.href;

cs page

if (!this.IsPostBack)
Session["Reset"] = true;
Configuration config = WebConfigurationManager.OpenWebConfiguration("~/Web.Config");
SessionStateSection section = (SessionStateSection)config.GetSection("system.web/sessionState");
int timeout = (int)section.Timeout.TotalMinutes * 1000 * 60;
ClientScript.RegisterStartupScript(this.GetType(), "SessionAlert", "SessionExpireAlert(" + timeout + ");", true);
Updated 5-May-21 0:54am

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