title: Can you use optional parameters in a WCF service method?
body: <p>I've seen posts like <a href="https://stackoverflow.com/questions/5781342/wcf-and-optional-parameters">this</a> and <a href="https://stackoverflow.com/questions/2649680/named-and-optional-parameters-and-wcf">this</a> but they are each a few years old.</p>
  
  <p>Can I do something like this? </p>
  
  <pre><code>    [OperationContract]
      [FaultContract(typeof(MyCustomFault))]
      List&lt;InventoryPart&gt; SelectMany(string partialPartNumber, string division = null);
  </code></pre>