public void Fetch() { IDBCollection c = Mongo.DefaultDatabase.GetCollection("test"); c.Drop(); Document obj = new Document() {{"test","me"}}; c.Save(obj); DBRef r = new DBRef(c, obj.ID); IDocument deref = r.Fetch(); Assert.That(deref, Is.Not.Null); Assert.That(deref.ID, Is.EqualTo(obj.ID)); }