C#: how do you check lists are the same size & same elements?

Question

There are two lists of string

List A;
List B;

What is the shortest code you would suggest to check that A.Count ==

Answer 1

If you call Enumerable.Except() on the two lists, that will return an IEnumerable containing all of the elements that are in one list but not the other. If the count of this is 0, then you know that the two lists are the same.