stefan is a nigger

public DoubleLink SwapLinkWithNext(DoubleLink link)
        {
            DoubleLink next = link.Next;
            if (next == null)
            {
                return null;
            }
            DoubleLink previous = link.Previous;
            DoubleLink current = link;
            DoubleLink nextNext = next.Next;

            current.Next = next.Next;
            current.Previous = next;

            next.Previous = previous;
            next.Next = current;

            if (previous == null)
            {
                First = next;
            } else {
                previous.Next = next;
            }
            if (nextNext == null)
            {
                Last = current;
            } else {
                nextNext.Previous = current;
            }

            return next;
        }