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Session_Start firing upon every request

Posted on 2011-03-01
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Last Modified: 2012-05-11
Session_Start is firing upon every request in an asp.net Application after calling Session.Abandon() and FormsAuthentication.SignOut().

I have attached sample code that shows the behavior I am seeing. Follow the steps below with the sample code.
1: Set breakpoints on Session_Start and Session_End method in global.asax
2: Login into the website
3: Use links provided to navigate between two pages(Home and Page2).
4: Click Logout but don't close the browser
5: Repeat step 2-3

After second login you will see Session_Start and Session_End is called upon every page request i.e. when you navigate between home and page2. The most important thing is Session_End is called immediately after Session_Start before the page is shown.

Points to note:
1: I am doing manual logout in the logout.aspx.cs by calling FormsAuthentication.Signout() and also calling Session.Abandon.
2: If I comment out the Session.Abandon() in the logout.aspx.cs page, it works fine and Session_Start doesn't fire upon every request.
3: I have tried IE and FF.

There is something really small concept I am missing about Session here. Anyone has any ideas?

PS: I wasn't able to upload .asax file but here is the content of global.asax.

 login.zip
<%@ Application Language="C#" %>

<script runat="server">
    void Session_Start(object sender, EventArgs e) 
    {
        //set breakpoint
    }
    void Session_End(object sender, EventArgs e) 
    {
        //set breakpoint
    }
       
</script>

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Question by:guru_sami
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guru_sami earned 0 total points
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The answer provided here by Alex B seems to be solving the problem.

But I am wondering why is this happening? My understanding is since the browser is not closed the same SessionID is used and that is something causing such recursive behavior.
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by:Stephan
Stephan earned 100 total points
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When you are setting the session.abandon, you will loose your sessionID, on every page request there will be a new sessionID untill you set a session that references to this sessionID.

I got this question myself a few weeks ago that from .net 2.0 always recreate a sessionID untill there is a session to maintain.

So in your case the following happens:

1. login, nothing is wrong
2. logout, session is abandoned
3. page_request, sessionid created (e.g. session_start)
4. page_unload, sessionid is lost (e.g. session_end)

step 3 and 4 will always be done untill a new session is set.

If there are any questions, I'd love to hear.
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by:crisco96
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If you want the user to keep using the same session ID use Session.Clear() instead of Session.Abandon()
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by:guru_sami
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@Stephan,
The SessionID is remaining the same and that's because I am not closing the browser. And it remains the same even after setting some dummy session. SessionID changes only with new browser.

@crisco96,
No, it's not I want to reuse the SessionID because it always remains the same with or without Session.Abandon.

In general what I am looking for is what is causing this?
1: Setting a dummy session in Session_Start makes it work so what does it do?
2: It works fine if I change the framework to 4.0. So what change in 4.0 makes it work?
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by:Stephan
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by:guru_sami
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"..a new session ID is generated for each page request until the session object is accessed."

Yes, I see that but once you start using the session or even if you just define an empty Session_Start block in your Global.asax, the SessionID becomes constant.
You can try in by simply outputting SessionID in the default.aspx and Page2.aspx in the sample code I provided.
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by:guru_sami
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Didn't get accurate answer.
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