title: .net MVC：How do I serve static files only to authorized users
body: <p>There are static files in my website like:</p>
  <blockquote>
  <p><a href="http://myurl.com/Content/a.html" rel="nofollow noreferrer">http://myurl.com/Content/a.html</a></p>
  <p><a href="http://myurl.com/Content/b.html" rel="nofollow noreferrer">http://myurl.com/Content/b.html</a></p>
  </blockquote>
  <p>... etc</p>
  <p>I want to verify the user's authentication when access. The authentication should be check by database's data.</p>
  <p>My framework：ASP.NET MVC5</p>