title: How to require FileUpload with actual upload, not just selecting a file
body: <p>I have a FileUpload control along with a required field validator. It throws an error if the user doesn't click the Browse button to select a file (which is correct). However, if the user clicks the Browse button, but doesn't click the Upload button, ASP.NET's required validator doesn't throw an error. Any ideas how to fix?</p>