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How to Redirect to Another Page when Session Timeout in ASP.NET (when pages contain Ajax UpdatePanel)

, 18 Jun 2008 CPOL
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A small solution to deal with session timeout when using Ajax UpdatePanel

Introduction

Session timeout in ASP.NET is such an important problem with web developer. When session ends, we run into some exceptional situations. There are also many solutions to deal with this problem on the Internet. But few of them have discussed about redirecting to another page when there is session timeout, especially when we work with Ajax UpdatePanel.

So, I suggest a way to do this.

Solution

My main idea is: 3 minutes before session is gone, we will alert the user to save his/her data or make any postbacks. If user still does not do anything, then 5 milliseconds before session goes, we will redirect the page to Login.aspx (or just refresh page by redirecting to itself).

Using the Code

Add the following code to your Master page:

private void CheckSessionTimeout()
{
    string msgSession = 'Warning: Within next 3 minutes, if you do not do anything, '+
               ' our system will redirect to the login page. Please save changed data.';
    //time to remind, 3 minutes before session ends
    int int_MilliSecondsTimeReminder = (this.Session.Timeout * 60000) - 3 * 60000; 
    //time to redirect, 5 milliseconds before session ends
    int int_MilliSecondsTimeOut = (this.Session.Timeout * 60000) - 5; 

    string str_Script = @"
            var myTimeReminder, myTimeOut; 
            clearTimeout(myTimeReminder); 
            clearTimeout(myTimeOut); " +
            "var sessionTimeReminder = " + 
		int_MilliSecondsTimeReminder.ToString() + "; " +
            "var sessionTimeout = " + int_MilliSecondsTimeOut.ToString() + ";" +
            "function doReminder(){ alert('" + msgSession + "'); }" +
            "function doRedirect(){ window.location.href="/KB/session/login.aspx"; }" + @"
            myTimeReminder=setTimeout('doReminder()', sessionTimeReminder); 
            myTimeOut=setTimeout('doRedirect()', sessionTimeout); ";

     ScriptManager.RegisterClientScriptBlock(this.Page, this.GetType(), 
           "CheckSessionOut", str_Script, true);
}
private void Page_Load(object sender, System.EventArgs e)
{
    this.CheckSessionTimeout();
}

If you do not want to redirect to login page, you can just refresh the page by replacing it by this code:

function doRedirect(){ window.location.href=window.location.href; }

If you do not use ScriptManager, you can replace with Page.RegisterClientScriptBlock(...)

Hope this helps.

History

  • 18th June, 2008: Initial post 

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Nguyen Quy Minh
Chief Technology Officer
Vietnam Vietnam
MCSD, MSc
http://www.sirvina.com

Comments and Discussions

 
QuestionGreat solution, you are genius Nguyen [modified] PinmemberMember 26560432-May-14 8:33 
Questionsession Pinmemberaashish tyagi2-Apr-14 21:47 
QuestionHelp Pinmembercharmax12-Dec-12 12:03 
GeneralMy vote of 5 PinmemberChandraShekar.SK7-Aug-12 5:41 
QuestionYour code is simple and works nicely - I adapted to VB.NET and used on the site's Master Page Pinmemberjacklennon10-Feb-12 6:19 
GeneralMy vote of 5 Pinmemberjacklennon10-Feb-12 6:10 
QuestionExcellente article! Thanks PinmemberBruno Lemos27-Oct-11 7:23 
GeneralMy vote of 5 Pinmemberdigjam94229-Mar-11 21:36 
Generallogin.aspx PinmemberAjay Kale New27-Sep-10 1:17 
Generalre automatic redirection to Login.aspx PinmemberAjay Kale New9-Sep-10 3:34 
Questionhow to create secured login page Pinmemberappusri53874-Nov-09 2:56 
QuestionHow to add session renew state to the alert box? PinmemberRobert H.12-Aug-08 8:59 
AnswerRe: How to add session renew state to the alert box? PinmemberNguyen Quy Minh12-Aug-08 21:28 
GeneralRe: How to add session renew state to the alert box? PinmemberRobert H.13-Aug-08 10:31 
GeneralRe: How to add session renew state to the alert box? PinmemberNguyen Quy Minh13-Aug-08 20:07 
GeneralRe: How to add session renew state to the alert box? PinmemberRobert H.14-Aug-08 6:37 
GeneralRe: How to add session renew state to the alert box? Pinmemberrcarroll14-Jan-09 11:20 
GeneralRe: How to add session renew state to the alert box? Pinmemberksalvage15-Jan-09 4:52 
GeneralRe: How to add session renew state to the alert box? PinmemberNguyen Quy Minh16-Jan-09 18:54 
QuestionWorks fine but confirm box comes even when I am working on screen Pinmemberchaggu9-Jul-08 13:03 
AnswerRe: Works fine but confirm box comes even when I am working on screen PinmemberNguyen Quy Minh10-Jul-08 0:25 
QuestionRe: Works fine but confirm box comes even when I am working on screen Pinmemberchaggu10-Jul-08 4:22 
AnswerRe: Works fine but confirm box comes even when I am working on screen PinmemberNguyen Quy Minh11-Jul-08 7:12 
GeneralRe: Works fine but confirm box comes even when I am working on screen Pinmemberchaggu24-Jul-08 5:19 
I am using an Alert box instead of Confirm box and it works for my scenario.
Thanks for replying.
Thanks,
Chaggu.
GeneralMany thanks Pinmembertndang4-Jul-08 4:14 
GeneralNo effect when something happened in update panel. PinmemberStressBall3-Jul-08 1:23 
GeneralRe: No effect when something happened in update panel. PinmemberNguyen Quy Minh3-Jul-08 7:03 
GeneralRe: No effect when something happened in update panel. PinmemberStressBall3-Jul-08 17:49 
GeneralRe: No effect when something happened in update panel. PinmemberNguyen Quy Minh4-Jul-08 4:04 
GeneralRe: No effect when something happened in update panel. Pinmemberanukit24-Sep-08 4:48 
GeneralSome more improvements... PinmemberTuomas Hietanen27-Jun-08 6:38 
GeneralRe: Some more improvements... PinmemberNguyen Quy Minh27-Jun-08 8:22 
Generalthanks! Pinmembervegeta4ss25-Jun-08 5:17 
QuestionWhat if javascript is disabled? Pinmemberevolved19-Jun-08 9:04 
AnswerRe: What if javascript is disabled? PinmemberNguyen Quy Minh19-Jun-08 22:48 
QuestionWhat about inheritante? Or Forms authentication? Pinmembertkrafael_net19-Jun-08 7:04 
AnswerRe: What about inheritante? Or Forms authentication? PinmemberNguyen Quy Minh19-Jun-08 8:56 
AnswerRe: What about inheritante? Or Forms authentication? PinmemberGeorge Peters2-Jul-08 4:40 
GeneralRe: What about inheritante? Or Forms authentication? Pinmembertkrafael_net2-Jul-08 14:27 
GeneralRe: What about inheritante? Or Forms authentication? PinmemberNguyen Quy Minh3-Jul-08 7:00 

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