title: How to retrieve a subset of fields using the C# MongoDB driver?
body: <p>I've searched the world over and can't seem to find the answer to this.</p>
  
  <p>How do I do this in C#:</p>
  
  <pre><code>// retrieve ssn field for documents where last_name == 'Smith':
  db.users.find({last_name: 'Smith'}, {'ssn': 1});
  </code></pre>
  
  <p>Thanks!</p>