How to check list A contains any value from list B?

Question

List A:

1, 2, 3, 4

List B:

2, 5

How to check if list A contains any value from list B?

e.g. someth

Answer 1

Sorry, if this is irelevant, but will return list with matches using FindAll() in case you need this:

        private bool IsContain(string cont)
    {
        List ListToMatch= new List() {"string1","string2"};

        if (ListToMatch.ToArray().Any(cont.Contains))
        {
            return false;
        }
        else
            return true;
    }

And usage:

List ListToCheck = new List() {"string1","string2","string3","string4"};
List FinalList = ListToCheck.FindAll(IsContain);

The final list contains only the matched elements string1 and string2 from list to check. Can easy be switched to int List.