title: How to serialize an object to Geode
body: <p>I'm still quite new to apache geode...</p>
  
  <p>I currently put objects in geode region using <code>fromData(IPdxReader)</code> and <code>toData(IPdxWriter)</code> and I write/read line by line.</p>
  
  <p>I need to add a new object, that is hundreds of lines long. </p>
  
  <p>How to serialize a whole object without serializing it line by line?</p>