How to compare two List to each other? [duplicate]

Answer 1

You could also use Except(produces the set difference of two sequences) to check whether there's a difference or not:

IEnumerable inFirstOnly = a1.Except(a2);
IEnumerable inSecondOnly = a2.Except(a1);
bool allInBoth = !inFirstOnly.Any() && !inSecondOnly.Any();

So this is an efficient way if the order and if the number of duplicates does not matter(as opposed to the accepted answer's SequenceEqual). Demo: Ideone

If you want to compare in a case insentive way, just add StringComparer.OrdinalIgnoreCase:

a1.Except(a2, StringComparer.OrdinalIgnoreCase)