Session Variable Loses Value While Session Still Active

VWD 2005 Express.  Visual Basic.

I am running into a situation that when I leave my session unattended, say for 20 minutes, and return to the session and navigate to another page on my site, I get an error when the code behind that page tries to access a session variable that was set when I logged on the session (Session("UserRole")).  If I navigate back to my home page first (where the session variable is first set in a section of code that runs if not a pastback), then the ession variable gets reinitialized and then I am okay.  Why am I losing the value in the session variable when my session sits idle for a while (the session variable only gets assigned in the pageload of my home page, and this should only have to happen once)?

Dr. Douglas Pruiett
Good News Jail & Prison Ministry
2/8/2008 5:30:45 PM 91979 articles. 4 followers. Follow

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Basically I want my session and session variables to time out at the same time.  If they do time out, I want the session automatically ended and a login required.  At present this is not happening.  My session variables are timing out without the session being logged out.  Any help will be appreciated.  Thanks.

Dr. Douglas Pruiett
Good News Jail & Prison Ministry
2/8/2008 5:59:16 PM

There is a default timeout(20Minutes) property for session objects. 

use Session.Timeout=30; to make it to 30minutes. 

use Session.Abandon to end the session. 

In the page_load even check if Session is null like:




as simple as that
2/8/2008 5:59:25 PM

Where do I put these?  I know I can put the following in the web.config:

<sessionState timeout="30"/>

I assume this is the same as your Session.Timeout=30.  I do not see an equivalent for Session.Abandon.  So where would I put these?  Thanks.

Dr. Douglas Pruiett
Good News Jail & Prison Ministry
2/8/2008 6:09:38 PM

Chaplain Doug:

Basically I want my session and session variables to time out at the same time.  If they do time out, I want the session automatically ended and a login required.  At present this is not happening.  My session variables are timing out without the session being logged out.  Any help will be appreciated.  Thanks.

Just check if Session is null in your page load even and redirect it if null.

Session.Abandon is to forcefully end a session. U have to put it in the .CS file

as simple as that
2/8/2008 6:28:09 PM

VB does not recognize If Session("UserRole")=Null Then . . .  It does not recognize Null.  Moreover, if the session variable does not exist how can we do a check without getting an error for trying to reference a nonexistent variable?  Finally, I do not have a login.aspx, as I use Basic Authentication (AD).  The login prompt will not come up unless the person has been logged off.  I find that using Session.Timeout=20 simply times out the session after 20 minutes but DOES NOT log off the person.  Hence, redirecting them to my default.aspx page will not produce a login prompt.  So my real issue is, how can I make the site log off the person when the session times out?


P.S.  I am still a novice and don't even know what the .cs file is.

Dr. Douglas Pruiett
Good News Jail & Prison Ministry
2/8/2008 6:45:28 PM

I am also new to ASP.NET.

C#  source files have a .CS extension. In your case it should be .vb since you are using VB.


as simple as that
2/8/2008 6:53:45 PM

Use the following:

If Session("sessionObject") Is Nothing Then

Mark this post as the "Answer" if it was the answer.
2/8/2008 8:43:30 PM

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