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4GuysFromRolla.com : ASP FAQS : Session Object


This question comes from Steve: How can I kill one session variable at a time? "I don't want to have to abandon the whole session, just kill off a few session variables that were used?"

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Answer: If you are using ASP 3.0 (the version of ASP that comes with Windows 2000 / IIS 5) then you can use the following syntax:

Session.Contents.Remove "name"

where Name is the name of the Session variable you wish to remove. Removing Session variables in this way has its advantages over using the following method:

Session("Name") = Null

Namely, the above method (setting a Session variable to Null) only removes the memory associated with the Session variable itself... the Session object still maintains a reference to it, though. Each Session variables is stored in the Session object with a key/item pair, similar to the Scripting.Dictionary object. Therefore, using the Null method above, you are not removing the key from the Session Contents collection that contains the reference to the variable...

With the Remove method that we looked at first, you are removing both the key and item associated with a Session variable. There is also a RemoveAll method that can be used to scrap all of the Session variables completely:


Again, the Remove and RemoveAll methods are new to ASP 3.0. If you have ASP 2.0, you will need to use the Null method.

For more information on this, be sure to read: Removing Session and Application Variables. Furthermore, to see how to use the Contents collectoin to programmatically list the contents of the Session (or Application) object, check out: Listing Session and Application Variables.

Happy Programming!

FAQ posted by Scott Mitchell at 10/29/2000 4:22:00 PM to the Session Object category. This FAQ has been viewed 65,649 times.

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Last computed at 9/17/2007 3:22:00 AM

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