Compare two List objects for equality, ignoring order [duplicate]

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Yet another list-comparing question.

List<MyType> list1;
List<MyType> list2;

I need to check that they both have the same elements, regardless of their position within the list. Each MyType object may appear multiple times on a list. Is there a built-in function that checks this? What if I guarantee that each element appears only once in a list?

EDIT: Guys thanks for the answers but I forgot to add something, the number of occurrences of each element should be the same on both lists.

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