Wait for file to exist in ASP.NET
<p>I have an ASP.NET page, where the user is able to trigger a console app on our server, which generates a file. What I want is the user to see a message that states 'Requesting file', then as soon as the file becomes available (i.e. <code>File.Exists</code> for the file returns true), the Requesting file message will change to a link of the file.</p>

<p>Is this easy to accomplish in ASP.NET?</p>
