title: How to query indexes in mongodb using the C# driver
body: <p>I have the following data structure:</p>
  
  <pre><code>{
     eventname: "blah",
     invitees: [
       {
          inviteid: 1,
          userid: 34234
       },
       {
          inviteid: 2,
          userid: 5232
       }]
  }
  </code></pre>
  
  <p>I am going to use <code>ensureIndex</code> on my invitees column so i do not have to search through every document to find specific userids in the invitees column.  Its basically searching for events that a specific userid was invited to.  I was suggested to use this <code>db.events.find({"invitees.userid" : 34234})</code> to query it, but how do i do this in c# with then 10gen driver.  the <code>.find</code> method only accepts a Mongo Query object.  </p>