How to alert message when session ends in mvc

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Javascript

MVC

I have made session time setting in web config as

<sessionState mode="InProc" cookieless="true" timeout="1" />

now i m checking here as..

Protected Overrides Sub OnActionExecuting(filterContext As ActionExecutingContext)
        '*****************************************
        ' check if session is supported
        If HttpContext.Session IsNot Nothing Then
            ' check if a new session id was generated
            If HttpContext.Session.IsNewSession Then

                If Not filterContext.HttpContext.Request.IsAjaxRequest() Then
                    Dim sessionCookie As String = HttpContext.Request.Headers("Cookie")
                    If (sessionCookie IsNot Nothing) AndAlso (sessionCookie.IndexOf("ASP.NET_SessionId") >= 0) Then
                        Dim viewData = filterContext.Controller.ViewData
                        'viewData.Model = username;
                        filterContext.HttpContext.Response.StatusCode = 504
                        'filterContext.Result = new ViewResult { ViewName = "/Home/SessionExpire.aspx", ViewData = viewData };

                        'ctx.Response.Redirect("~/Home/Login");
                        HttpContext.Response.Redirect("~/Case/TimeOut")

                    End If


                End If
            End If
        End If

On

HttpContext.Response.Redirect("~/Case/TimeOut")

i m calling partial view to call alert , of session end like this

<script>
         var sessionTimeoutWarning = "You Session is going to finish in one minute.";
         var sessionTimeout = "<%= Session.Timeout %>";
         var timeOnPageLoad = new Date();
         var sessionWarningTimer = null;
         var redirectToWelcomePageTimer = null;
         //For warning
         var sessionWarningTimer = setTimeout('SessionWarning()', parseInt(sessionTimeoutWarning) * 60 * 1000);
         //To redirect to the welcome page
         var 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
             answer = confirm(message);

             //if yes, extend the session.
             if(answer)
             {
                 var img = new Image(1, 1);
                 img.src = '@Url.Action("CaseManage","Case")';   @*?date=' + escape(new Date());*@

                 //Clear the RedirectToWelcomePage method
                 if (redirectToWelcomePageTimer != null) {
                     clearTimeout(redirectToWelcomePageTimer);
                 }
                 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 = "@Url.Action("CaseManage","Case")";
             }
             //**************************
         }

         //Session timeout
         function RedirectToWelcomePage(){
             alert("Session expired. You will be redirected to welcome page");
             window.location = "@Url.Action("Index","LogOn")";
         }

     </script>

.

what does i want, when i got alert, that the, session is going to end, on clicking the, ok button, the, session extends.

Please Help...