How to Check whether Session is Expired or not in asp.net

Question

I've specified the session timeout in web.config file. When the session is timeout I'm not getting redirect to the login page but I am getting an error saying object reference not set to an instance.

Can anyone tell me the solution for this?

Answer 1

You can check the HttpContext.Current.User.Identity.IsAuthenticated property which will allow you to know whether there's a currently authenticated user or not.

Answer 2

Edit

You can use the IsNewSession property to check if the session was created on the request of the page

protected void Page_Load()  {     if (Context.Session != null)     {        if (Session.IsNewSession)        {           string cookieHeader = Request.Headers["Cookie"];           if ((null != cookieHeader) && (cookieHeader.IndexOf("ASP.NET_SessionId") >= 0))           {              Response.Redirect("sessionTimeout.htm");           }        }     }  } 

pre

Store Userid in session variable when user logs into website and check on your master page or created base page form which other page gets inherits. Then in page load check that Userid is present and not if not then redirect to login page.

if(Session["Userid"]==null) {   //session expire redirect to login page  }