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What is the requirement for a collection in order that we can put a foreach on it in c#? What are the types on which we can put for each?
EDIT 1: Can anybody come up with a sample code of a User Defined Collection on which Foreach is Implemented.
It implements
IEnumerableorIEnumerable<T>Edit: there is the wrinkle that if the type has method called GetEnumerator() that returns an IEnumerator then it is also usable in a foreach. see http://brendan.enrick.com/post/Foreach-IEnumerable-IEnumerator-and-Duck-Typing.aspx