title: MongoDb bulk operation get id
body: <p>I want to perform bulk operation via MongoDb. How to get array of Ids that will be returned after it?</p>
  
  <p>Can i perform single-operation insert faster without using bulk ? Can you advise me some other approach ?
  I'm using <code>C# mongoDb driver 2.0</code> and <code>MongoDb v. 3.0.2</code></p>
  
  <p>update:
  I found the following solution - save maximum <code>ObjectId</code> of mongo collection,</p>
  
  <pre><code>db.col.find().sort({_id:-1}).limit(1).pretty()
  </code></pre>
  
  <p>and do the same after insert
  So we will get the range of inserted documents, does it make a sense?</p>