Check for any element that exists in two collections

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Sounds like you just want:

bool hasSameElements = listA.Intersect(listB).Any();

EDIT: As noted in comments, Intersect uses lazy evaluation. It defers all execution until the first element is read from the result; at that point it will load all of listB into a set, and then stream listA until it finds a result to yield. At that point, Any() will return true and so no more work will be done. See my Edulinq post on Intersect for more information.

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