Keep Session Alive

<script language="javascript" type="text/javascript">

    var sessionTimeoutWarning = '<%= System.Configuration.ConfigurationSettings.AppSettings["SessionWarning"].ToString()%>'; //get Value from Webcofig

    var sessionTimeout = "<%= Session.Timeout %>"; //Get Sesstion TimeOut

    var timeOnPageLoad = new Date();

    var sessionWarningTimer = null;

    var redirectToWelcomePageTimer = null;

    //For warning

    var sessionWarningTimer;

    //To redirect to the welcome page

    var redirectToWelcomePageTimer;

    function CheckBrowserSession() {

        //For warning

        sessionWarningTimer = setTimeout('SessionWarning()', parseInt(sessionTimeoutWarning) * 60 * 1000);

        //To redirect to the welcome page

        redirectToWelcomePageTimer = setTimeout('RedirectToWelcomePage()', parseInt(sessionTimeout) * 60 * 1000);

    }

    //Session Warning

    function SessionWarning() {

        //minutes left for expiry

        var minutesForExpiry = (parseInt(sessionTimeout) - parseInt(sessionTimeoutWarning));

        var message = 'Your session will expire in another ' + minutesForExpiry + 'mins. Do you want to extend the session?';

        //Confirm the user if he wants to extend the session

        if (Confirm(message)) {

            if (redirectToWelcomePageTimer != null) {

                clearTimeout(redirectToWelcomePageTimer);

            }

            //reset the time on page load

            timeOnPageLoad = new Date();

            sessionWarningTimer = setTimeout('SessionWarning()', parseInt(sessionTimeoutWarning) * 60 * 1000);

            //To redirect to the welcome page

            redirectToWelcomePageTimer = setTimeout('RedirectToWelcomePage()', parseInt(sessionTimeout) * 60 * 1000);

        }

        //*************************

        //Even after clicking ok(extending session) or cancel button,

        //if the session time is over. Then exit the session.

        var currentTime = new Date();

        //time for expiry

        var timeForExpiry = timeOnPageLoad.setMinutes(timeOnPageLoad.getMinutes() + parseInt(sessionTimeout));

        //Current time is greater than the expiry time

        if (Date.parse(currentTime) > timeForExpiry) {

            alert("Session expired. You will be redirected to welcome page");

            window.location = "Login/index";

        }

        //**************************

    }

    //Session timeout

    function RedirectToWelcomePage() {

        alert("Session expired. You will be redirected to welcome page");

        window.location = "Login/index";

    }

  $(document).ready(function () {

            CheckBrowserSession()

   

            });

</script>