title: Cannot perform runtime binding on a null reference
body: <p>I have a detail pages which has the ids, but if i don't pass id in <a href="http://mysite.com/Detail?id=131" rel="nofollow">http://mysite.com/Detail?id=131</a> or if I just type <a href="http://mysite.com/Detail" rel="nofollow">http://mysite.com/Detail</a> i get the error</p>
  
  <pre><code>Cannot perform runtime binding on a null reference
  </code></pre>
  
  <p>i want to show custom error message on this, how to do this ?</p>