Remove an element from one list who matches another element from another list

I have two list with the next values:

List A:

• ‘9999’
• ‘1111’

List B:

• ‘1111’

I want to remove from List A the element who matches with anyone of the list B. In this case
list A (or a new list) should have:

List C:

• ‘9999’

I was looking for an optimus way of do it but I can’t find anyone. Any suggestion?

>Solution :

I am not sure if this is what you are looking for:

List<Integer> result = listA.Except(listB).ToList();