Alert user before session timeout

Note: Cross posted from Vijay Kodali's Blog . Permalink Here is a quick & dirty trick to alert users

Alert user when their session is about to expire

Note: Cross posted from Vijay Kodali's Blog . Permalink Here is a quick and dirty trick to alert

This is fine if you're using a homegrown, session-based login, but it's a bit more complicated to get the amount of time until timeout when using ASP.NET forms based authentication and the membership provider.  Specifically, the sliding timeout causes the timeout duration to vary on postback, and you need to check the FormsAuthenticationTicket for the amount of seconds remaining in the current window.

Something like this will return the actual amount of seconds until the forms authentication ticket expires:
var authTicket = System.Web.Security.FormsAuthentication.Decrypt(Request.Cookies[System.Web.Security.FormsAuthentication.FormsCookieName].Value);
var secondsToTimeout = Convert.ToInt32(authTicket.Expiration.Subtract(DateTime.Now).TotalSeconds);

Then to warn/redirect at 2 minutes and 1 minute prior to timeout:
var primaryWarningSeconds = (timeoutSeconds - 120);
var secondaryWarningSEconds = (timeoutSeconds - 60);

Hi
Thanks for this article..but i have a single question..

Let say i am implementing this code in my application which is of two individual forms and i am opening two different forms in two different tabs(browser tab) will it work properly? I think no because it will show two different pop-up messages for two different forms.

Is there any way to solve this?

Thanks
Vimal

It was great.

Hi Nice example , but never work for me...

where will put first code in my asp file and no pop up....



please its very urgent help me

please post your full code

Hi...
Two button OK and Cancel within panel doesnot work for me.
It want that when I click OK it should extend session for me and when i click cancel it should log out to the admin login page.

<cc1:ModalPopupExtender ID="mpe_alert" runat="server"  TargetControlID="pnlAlert"  CancelControlID="btnCancel" OKControlID="btnOK"
           PopupControlID="pnlAlert" BehaviorID="mpe_alert">
       </cc1:ModalPopupExtender>

       <aspanel style="display: none" ID="pnlAlert" runat="server">
     <table  style="height:100px;background-color:#ffffff;" cellspacing="0" cellpadding="0" width="340" border="0" >
       <tbody>
       <tr>
                <td  style="width: 200px; color:#ffffff; height:20px; background-color:#003366">

                                        Security Warning
                </td>
       </tr>
       <tr>
                <td>
                </td>
       </tr>
       <tr align="center">
                <td>
                    Your login session is about to expire.Do you want to extend it?
                </td>
       </tr>
       <tr>
                <td>
                    <table cellpadding="0" cellspacing="0" width="100%" border="0">
                    
                     <tr align="center">
                        <td>
                        <a href="../AdminLogin.aspx" >Logout</a>
                        <asp:Button ID="btnOK" runat="server" Text="Continue" OnClick="btnContinue_Click" />
                        <asp:Button ID="btnCancel" runat="server" Text="Logout" OnClick="btnCancel_Click"/>
                        </td>
                    
                     </tr>
                    
                    </table>
                
                
                </td>
      
       </tr>
      
       </tbody>

       </table>
       </aspanel>
Now in code behind file
In button_click event I have following code

protected void btnCancel_Click(object sender, EventArgs e)
    {
        Response.Redirect("AdminLogin.aspx");
    
    }
protected void btnOK_Click((object sender, EventArgs e)
{
//I want here code to extend session
}

Problem is that both of button does not get fired when I click it.I think it is issue with modal popup extender.Please anyone can help me I am trying since two days...
It is urgent for me.
Thanks in advance

Hi I have a question.Your code works fine and display messages 2 min before timeout and if I don't click anything after the prompt comes, it take me back to login page.But I don't get one point. I have set the seesion time out for 3 minutes for testing purpose. So 1 min after i login i get prompt and when I click OK as per my understanding, code will retain session for next 3 minutes and teh code will prompt for the message again. BUt I am not getting that prompt after I click OK.Please tell me what I did wrong

Hi I have a question.Your code works fine and display messages 2 min before timeout and if I don't click anything after the prompt comes, it take me back to login page.But I don't get one point. I have set the seesion time out for 3 minutes for testing purpose. So 1 min after i login i get prompt and when I click OK as per my understanding, code will retain session for next 3 minutes and teh code will prompt for the message again. BUt I am not getting that prompt after I click OK.Please tell me what I did wrong

Hi the reason was that i was using updatepanel, and I have placed the code in not postback loop. Changing that resolved my issue. But I have another problem. When I click OK the page gets refreshed, thus extends my session time. But the popup message not evn checking idle time. Means I have set the session timeout to 3 minutes for testing purpose. So whatever post back I do in each 3 minutes I am getting this popup. What I need is when user becomes idle for certain time show this message

Very Nice yaar.............
thanks..

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How Can I Call WebService to create new session could you please provide sample snippet for that.
thanks in advance.

This code redirects after a fix time irrespective of inactive session , where as session doesn't timeouts is use is active on site