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How to do auto logout and redirect to login page when session expires using asp.net?

In this article I will explain you how to auto logout and redirect to
 login page when users session expires within specific period.

Introduction


In every applications, we need to maintain the session expiration time 
say for example 1hr or 30 minuets and this configuration item we
 can do with web.config file or in IIS. But here, application should 
redirect to login page automatically when session expires.

Configure session time


First configure the session timeout value in web.config file as like
 below, here I’m configuring the session timeout value as 3 minutes
 for this sample .

<system.web>



<sessionState mode="InProc" timeout="3"></sessionState>



</system.web>

 

Create Pagebase class


create a custom pagebase class and write the common functionality codes into this class. Through this class, we can share the common functions to other web pages. In this class we need inherit the System.Web.UI.Page class. Place the below code into Pagebase class.e

public class PageBase : System.Web.UI.Page



{



protected override void OnPreRender(EventArgs e)



{



    base.OnPreRender(e);



    AutoRedirect();



}



public void AutoRedirect()



{



int int_MilliSecondsTimeOut = (this.Session.Timeout * 60000);



string str_Script = @"



   <script type='text/javascript'> 



    intervalset = window.setInterval('Redirect()'," + int_MilliSecondsTimeOut.ToString() + @");



    function Redirect()



    {



       alert('Your session has been expired and system redirects to login page now.!\n\n');



       window.location.href='/login.aspx'; 



    }



</script>";



ClientScript.RegisterClientScriptBlock(this.GetType(), "Redirect", str_Script);



}



}

 


Above AutoRedirect function will be used to redirect the login page when session expires, by using javascript window.setInterval, This window.setInterval executes a javascript function repeatedly with specific time delay. Here we are configuring the time delay as session timeout value. Once it’s reached the session expiration time then automatically executes the Redirect function and control transfer to login page.
In testAutologout page, we need to inherit the PageBaseclass as like below also same thing we need to inherit wherever required this functionality.

using System;



using System.Collections.Generic;



using System.Linq;



using System.Web;



using System.Web.UI;



using System.Web.UI.WebControls;



namespace TestWeb



{



 public partial class testAutoLogout : PageBase



{



    protected void Page_Load(object sender, EventArgs e)



{







}



}

}
 

Once application reached session expiration time if suppose there is no action performed by user, it shows the warning message as like below and if clicks the Ok in the message box it redirects to login.aspx page.

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