I was debugging one of my code and found interesting output for me.

At the MongoQueryObject.Query there was text :

{ "$where":

{ "$code": "(((this.ServiceKey === 4c46d7657c1a601774000002) && (this.ResourceKey === 4c46d7657c1a601774000003)) && ((((this.Start >= 01/01/2000 10:00:00) && (this.Start < 01/01/2000 18:00:00)) || ((this.End > 01/01/2000 10:00:00) && (this.End <= 01/01/2000 18:00:00))) || ((this.Start < 01/01/2000 10:00:00) && (this.End > 01/01/2000 18:00:00))))" }

}

As i understand from MongoDb docs after $where should be JavaScrip
code to run on server side.

Question 1: why it didn't translated into json notation to find
document ?
Answer: maybe because we have more then one condition per field

Question 2: if it is JavaScript code, why values don't have quotes
'4c46d7657c1a601774000002' and '01/01/2000 10:00:00'

Maybe better make like the following
this.End <= new Date(2000,1,1,18,0,0)

link: http://groups.google.com/group/mongodb-csharp/browse_thread/thread/b00e288d0ebce78