title: Forcing custom 404 pages for pages in URL Routing
body: <p>Coding Platform ASP.NET 4.0 WebForms on IIS7.5</p>
  
  <p>If I request a page <code>blahblah.aspx</code> which does not exist, I get navigated to my custom error page for Page not found Exception. I have implemented URL routing and so I have omitted all my .aspx extensions for routes.</p>
  
  <p>Now, If I type<code> www.mysite.com/blahblah</code> (thats a url without extension) instead of going to my custom error page, it gets redirected to my IIS 404 error page.  </p>
  
  <p>What should I do to make my custom error page appear on my site instead of IIS error page?</p>