title: Nullable shortcut or extension for parameters
body: <p>I have the following line of code that I repeat zillion times, and there are similar codes.</p>
  
  <pre><code>    public ActionResult View(int ? id)
      { 
          if (id.HasValue == false)
          {
              return HttpNotFound();
          }
         .....
  
      }
  </code></pre>
  
  <p>How can i make this shorter?</p>