title: Create external link in Asp.Net MVC3
body: <p>I know there are a lot of utility and helper classes/methods for generating URLs and links from internal routes and controllers.  But how would you tackle the below in MVC 3?</p>
  
  <p>In a razor file someone has defined this:</p>
  
  <pre><code>&lt;a href="http://@Model.Details.ExternalURL" target="_blank"&gt;Website&lt;/a&gt;
  </code></pre>
  
  <p><code>ExternalURL</code> in this instance will hold values like <code>www.yoursite.com</code>, without any prefixes.  Hard-coding an <code>http://</code> at the start is an obvious no-no but how best to handle this?</p>