Automating A Task

I have an ASP application which includes an asp page which
processes a user submitted file. I would like to
automate the process so the server scans the directory
every 5 minutes and processes any files in the directory.
I would like to 'reuse' the existing logic in the asp
page.

How can I create a server process to do this?
The closest I can figure out is to hook the logic into a
application/session start logic in global.asa where it
would run everytime a new session was started, but I would
like it to run like a cron job every 5 minutes. Code: