title: WebAPI and OData OrderBy
body: <p>I have a data model consisting of two entities</p>
  
  <pre><code>public class product 
  {
       public int ID {get;set;}
       public string Name {get;set;}
  }
  
  public class category
  {
      public int ID {get;set;}
      public string Name {get;set;}
      public IEnumerable&lt;product&gt; products {get;set;}
  }
  </code></pre>
  
  <p>What I need to do: starting from category how can I sort by product name?</p>
  
  <p>I've tried something like this: </p>
  
  <p><code>api/categories?$orderby=?</code></p>