title: Use data annotation to create comma separated number
body: <p>I am using the following data annotation and my goal is display a comma separated number in the UI. </p>
  
  <pre><code> [DisplayFormat(DataFormatString = "{0:N2}")]
   public double ItemSubTotal { get; set; }
  </code></pre>
  
  <p>Here's the view code: </p>
  
  <pre><code>&lt;fieldset&gt;
         @Html.LabelFor(m =&gt; m.Order.ItemSubTotal, Model.Order.ItemSubTotal.ToString())                  
  &lt;/fieldset&gt;
  </code></pre>
  
  <p>However I am not getting a comma separated result. Any ideas? </p>