Added: July/08/2004 at 8:02pm | IP Logged

Dynamically show the results in a listbox based on what was chosen in another listbox.

You can use dependent listboxes for example to let a user choose a rep in a reps listbox and then have only the customers for that rep be shown in the customers listbox.

And perhaps this may hopefully give some ideas, it's got a downloadable sample, and does retain values after the post back:

ASP Design Tips - Dependent Listboxes
http://www.bullschmidt.com/devtip-dependentlistboxes.asp