title: Return entire collection from MongoDB
body: <p>using the official mongo / c# drivers - what is the best way of returning an entire collection, and what is the best way of storing the data? I've seen some examples of iterating over a collection and returning a particular value, like this:</p>
  
  <pre><code>var collection = db.getCollection("users").findAll();
  foreach (var value in collection){
       value = collection["key"];
       ...
  }
  </code></pre>
  
  <p>but what if I don't know the key names - and I just want to return the collection?</p>