title: silverlight Application can not use wcf namespace
body: <p>I have a Silverlight application with a web application to test it,
  there are two WCF services I created on my web application.
  I can add reference all my services in my Silverlight application but when I want to use one of my data contracts ,I can not add my service namespace to the Silverlight application:</p>
  
  <p>ex: I have a person class in my WCF service(reference name)
  WCF service.person  = new wcfservice.person();</p>
  
  <p>Error: </p>
  
  <blockquote>
    <p>The type or namespace name 'WCF service' could not be found (are you
    missing a using directive or an assembly reference?)</p>
  </blockquote>