Count property vs Count() method?

Question

Working with a collection I have the two ways of getting the count of objects; Count (the property) and Count() (the method). Does anyone know what

Answer 1

The .Count() method might be smart enough, or know about the type in question, and if so, it might use the underlying .Count property.

Then again, it might not.

I would say it is safe to assume that if the collection has a .Count property itself, that's going to be your best bet when it comes to performance.

If the .Count() method doesn't know about the collection, it will enumerate over it, which will be an O(n) operation.