Question

How do I check whether a List contains an element that exists in another List using LINQ in C#? I don’t want to use a for/while loop.

So, if List1 has A, B, C and List2 has B, 1, 2, then I would return true.

Answer 1

Try this:

List<string> a = ...
List<string> b = ...
var inComon = a.Intersect(b).Any();