Compliment List of a sub List

Question

listSuper
listSub_A
listSub_B

Is there any extension methods that replace the following piece of code?

 foreach(int a in listSuper)
 {
 if (!listSub_A.Contains(a))
 {
 listSub_B.Add(a);
 }
 }

In short I want to fill listSub_B with elements in listSuper which are not in listSub_A.

Answer 1

listSub_B.AddRange(listSuper.Except(listSub_A));

Answer 2

listSub_B.AddRange(listSuper.Except(listSub_A));

Answer 3

Why not have a property rather than an extension method since you wont need to update listSub_B if listSub_A changes?

public ...  listSub_B
{
  get{return listSuper.Except(listSub_A);}
}