////   This file contains the C# code from Program 6.18 of//   "Data Structures and Algorithms//    with Object-Oriented Design Patterns in C#"//   by Bruno R. Preiss.////   Copyright (c) 2001--2002 by Bruno R. Preiss, P.Eng.  All rights reserved.////   http://www.brpreiss.com/books/opus6/programs/pgm06_18.txt//public class QueueAsLinkedList : AbstractContainer, Queue{    protected LinkedList list;    public QueueAsLinkedList()	{ list = new LinkedList(); }    public override void Purge()    {	list.Purge();	count = 0;    }    // ...}