Find elements existing in both collections using LINQ

Question

Say I have two collections

int[] foo = { 1, 2, 3, 4 };
int[] bar = { 2, 4, 6, 8 };

What would be the simplest way using linq to select values that exist in both collections?

i.e. a collection containing 2 and 4.

Answer 1

int[] result = foo.Intersect(bar).ToArray();