validation and file upload control

Hi,


I am using a wizard form to collect information from visitors to my site.

there are 2 or 3 file upload controls within the wizard and I am using
the HttpFileCollection class which loops through the files and uploads them to the server.

I want to use the set of validation controls to see that only image jpg or mp3 files are submitted.

Therfore when the user clicks the finish button on the wizard the Insert sql statement
wont be called if the file uploads controls dont contain the right file format.

Any advice appreciated.

Amereto ...