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Web Development » Session State » Sessions and Session State License: The Code Project Open License (CPOL)

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

By Nguyen Quy Minh

A small solution to deal with session timeout when using Ajax UpdatePanel
C#, Javascript, ASP, ASP.NET, WebForms, Ajax
Version:4 (See All)
Posted:18 Jun 2008
Views:31,825
Bookmarked:40 times
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14 votes for this article.
Popularity: 4.44 Rating: 3.87 out of 5
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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='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)

About the Author

Nguyen Quy Minh


Member
MCSD, MSc
http://www.sirvina.com
Occupation: Chief Technology Officer
Location: Vietnam Vietnam

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 Msgs 1 to 25 of 29 (Total in Forum: 29) (Refresh)FirstPrevNext
GeneralHow to add session renew state to the alert box? PinmemberRobert H.8:59 12 Aug '08  
GeneralRe: How to add session renew state to the alert box? PinmemberNguyen Quy Minh21:28 12 Aug '08  
GeneralRe: How to add session renew state to the alert box? PinmemberRobert H.10:31 13 Aug '08  
GeneralRe: How to add session renew state to the alert box? PinmemberNguyen Quy Minh20:07 13 Aug '08  
GeneralRe: How to add session renew state to the alert box? PinmemberRobert H.6:37 14 Aug '08  
GeneralRe: How to add session renew state to the alert box? Pinmemberrcarroll11:20 14 Jan '09  
GeneralRe: How to add session renew state to the alert box? Pinmemberksalvage4:52 15 Jan '09  
GeneralRe: How to add session renew state to the alert box? PinmemberNguyen Quy Minh18:54 16 Jan '09  
QuestionWorks fine but confirm box comes even when I am working on screen Pinmemberchaggu13:03 9 Jul '08  
AnswerRe: Works fine but confirm box comes even when I am working on screen PinmemberNguyen Quy Minh0:25 10 Jul '08  
QuestionRe: Works fine but confirm box comes even when I am working on screen Pinmemberchaggu4:22 10 Jul '08  
AnswerRe: Works fine but confirm box comes even when I am working on screen PinmemberNguyen Quy Minh7:12 11 Jul '08  
GeneralRe: Works fine but confirm box comes even when I am working on screen Pinmemberchaggu5:19 24 Jul '08  
GeneralMany thanks Pinmembertndang4:14 4 Jul '08  
GeneralNo effect when something happened in update panel. PinmemberStressBall1:23 3 Jul '08  
GeneralRe: No effect when something happened in update panel. PinmemberNguyen Quy Minh7:03 3 Jul '08  
GeneralRe: No effect when something happened in update panel. PinmemberStressBall17:49 3 Jul '08  
GeneralRe: No effect when something happened in update panel. PinmemberNguyen Quy Minh4:04 4 Jul '08  
GeneralRe: No effect when something happened in update panel. Pinmemberanukit4:48 24 Sep '08  
GeneralSome more improvements... PinmemberTuomas Hietanen6:38 27 Jun '08  
GeneralRe: Some more improvements... PinmemberNguyen Quy Minh8:22 27 Jun '08  
Generalthanks! Pinmembervegeta4ss5:17 25 Jun '08  
GeneralWhat if javascript is disabled? Pinmemberevolved9:04 19 Jun '08  
GeneralRe: What if javascript is disabled? PinmemberNguyen Quy Minh22:48 19 Jun '08  
GeneralWhat about inheritante? Or Forms authentication? Pinmembertkrafael_net7:04 19 Jun '08  

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Last Updated: 18 Jun 2008
Editor: Deeksha Shenoy
Copyright 2008 by Nguyen Quy Minh
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