title: Using EditorFor<> to render a drop-down list
body: <p>So far we can use Html.EditorFor() to dynamically render the appropriate template for a datatype - e.g. string, int, or a custom type, say 'Address'.</p>
  
  <p>Now I want to use EditorFor() to render a 'Parent' field. I want a drop-down containing every row, and the user picks a parent from this drop-down.</p>
  
  <p>The 'Parent' template has access to the 'ParentID', but what about the names and ID's of rows, to populate the list-box with?</p>
  
  <p>Where should these come from?</p>
  
  <p>I could put data-access logic in the template, but that would be violating the separation of concerns.</p>
  
  <p>I could create an HtmlHelper that renders the list, but wouldn't this also break separation of concerns, since HtmlHelpers should only do UI stuff, not data access?</p>
  
  <p>Any ideas?</p>