Check Session Timeot for Whole Application

1. Create a BasePage.cs in App_Code  and write the following code

        protected void Page_Init(object sender, EventArgs e)
        {
            if (Context.Session != null)
            {
                if (Session.IsNewSession)
                {
                    HttpCookie newSessionIdCookie = Request.Cookies["ASP.NET_SessionId"];
                    if (newSessionIdCookie != null)
                    {
                        string newSessionIdCookieValue = newSessionIdCookie.Value;
                        if (newSessionIdCookieValue != string.Empty)
                        {
                            //This means Session was timed Out and New Session was started
                            Response.Redirect("Home.aspx");
                        }
                    }
                }
            }
        }

2. Inherit this basepage on all the aspx pages such as
using System;
using System.Collections.Generic;
using System.Collections;
using System.Linq;
using System.Linq.Expressions;
using System.Web;
using System.Data;
using System.Web.UI;
using System.Web.UI.WebControls;
using VAS.BLL;
using VAS.DAL;
using VAS.PL;

public partial class _Default: BasePage
{
         ///body
}