title: C# .NET and Javascript Confirm
body: <p>I have a C# ASP.NET web page with an xml file upload form.  When the user clicks 'upload', a javascript confirm alert will pop up asking the user, "is this file correct?".   The confirm alert will only activate if the file name does not contain a value from one of the other form fields.</p>
  
  <p>What is the best way to combine the use of a C# ASP.NET form and a javascript confirm alert that is activated if the name of a file being uploaded does not meet certain criteria?</p>