How to automatically end/logout a session?

How to automatically end a session?
In idea, I have set up in web.config that after 20 minutes of no user action, my ASP NET application will call Logout.aspx and then logout automatically without showing any error aspx page.

In web.config:
<sessionState mode="InProc" stateConnectionString="tcpip=127.0.0.1:42424" sqlConnectionString="data source=127.0.0.1;Trusted_Connection=yes" cookieless="false" timeout="20"/>

In Global.asax.vb:
Private Sub Session_OnEnd(ByVal sender As Object, ByVal e As EventArgs)
        Server.Transfer("Logout.aspx", True)
End Sub

In Logout.aspx:
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Server.CreateObject("Session.Management").SessionEnd()
End Sub

But I'm not sure if after 20 minutes of no user action, Logout.aspx will be called. And the statement Server.CreateObject("Session.Management").SessionEnd() gets error!
What would be the correct way of ending session? Thanks!
IloveClipperAsked:
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esteban_felipeConnect With a Mentor Commented:
Hi IloveClipper,

Your code will actually end the session but the Server.Transfer("Logout.aspx",true) won't work. That's because you can't push pages to the client using server side code if the client haven't first requested a page. The correct way to achieve what you're looking for will be a client side javascript that will redirect to another page (logout.aspx in your case) 20 minutes after the current page was rendered.

Esteban Felipe
www.estebanf.com
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IloveClipperAuthor Commented:
Esteban,
Does it mean that I have to put that javascript code on every aspx page of my project?
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esteban_felipeCommented:
you could use a base Page class that register the javascript
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venkat_parupudiCommented:
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