title: What server validation logic transforms to unobtrusive client-side validation
body: <p>In MVC3 you could write something like this:</p>
  
  <pre><code>[Required(ErrorMessage="Please fill some field that I need")]
  public string someFieldThatINeed;
  </code></pre>
  
  <p>But what about custom validation attributes? Will they transforms to client-side javascript code and validate as well as embedded validation attributes do? Or do I need to write my own javascript client code? Thanks!</p>