title: how to WCF dynamic DataMember?
body: <p>example: a Customer class have 100 data member(id, name, age, address...etc)  to be serialization to JSON.</p>
  
  <p>In Config file such as Web.config, can set a output list to serialize JSON ouptut. </p>
  
  <p>If output only id and name, then JSON only have id and name.</p>
  
  <p>My Question: <strong>Can support dynamic DataMember in a DataContract ?</strong></p>