title: Google API Contacts : how to get Frequently contacted contacts
body: <p>I'm getting an issue with Google Api Contacts like below:</p>
  
  <p>I want to get contacts by some conditions such as :  how to get Frequently contacted contacts.</p>
  
  <p>Here is my code: </p>
  
  <pre><code>var contacts = new List&lt;ContactDTO&gt;();
                  var query = new 
  
      ContactsQuery(ContactsQuery.CreateContactsUri("default"));
                      query.NumberToRetrieve = 500;
                      query.FeedFormat = AlternativeFormat.Atom;
                      //query.Query = "???"
                      Feed&lt;Google.Contacts.Contact&gt; feed = _contactsRequest.Get&lt;Google.Contacts.Contact&gt;(query);
  </code></pre>
  
  <p>I don't what Query should I use? how to use the ContactsQuery.query? Please help me ! many thanks!</p>