I think the question is really clear
I disagree. Now I understand you want the number of records, rather than the record's number (such as an ID). The question may be clear to you but that's hardly relevant. It has to be clear to your audience (me, and other visitors to this forum) or we won't be able to help. I had no idea what you we're asking the first time so I couldn't help you.
With regard to your code:
Dim myReview as Review
Dim x = myReview.Count()
This won't work, as myReview is not a collection, but a single type. As such it has no Count method.
Hope this helps,