I am using the uploader in a .net user control and need the capability to issue a warning if someone tries to upload a second file.

Scenario is:

They upload one file

......something relating to that file happens

They go to upload a second file.

Give a warning that if they continue, the first file will be overwritten, but let them continue.

Where should I try to hook in to this action? I've spent time looking thru your docs and forum and trying things but haven't found the right kind of code.

Thanks