title: ASP.NET MVC Dynamic External URL
body: <p>I have a site where users can supply a URL of their choice.</p>
  
  <p>I'm sure it's a security hole so what should I do to tighten that down without losing too much flexability?</p>
  
  <p>If I were to leave it, how could I render a link or build a route such that I could link users externally?
  This doesn't work (of course):</p>
  
  <pre><code>&lt;a href="@item.Location" target="_self"&gt;@item.Title&lt;/a&gt;
  </code></pre>