Sort of my point - you don't need to know. You ask for an instance of IEnumerator and it supplies one. IEnumerator only implements a single property and a couple of methods but I'd still regard this as an example of a simple (but essential) factory.
Anyway I guess we're now discussing .NET examples rather than VFP so it doesn't really belong here. And I'm happy to not agree on a term that lacks a formal definition....

>I have no idea how it is implemented.
>
>>Why do the items instantiated need to be 'complex' ?
>>So you would not agree that, for example, in .NET ArrayList.GetEnumerator() is a factory method ?