//MyCompositeusing System;using System.Collections;

//----------------------------------Class FileElementabstract class CFileElement{ //Fields protected string name;  public CFileElement(string name) {  this.name=name; }

 public abstract void Add(CFileElement e); public abstract void Remove(CFileElement e); public abstract void Display();};

//Class CFileclass CFile:CFileElement{ public CFile(string name):base(name){}  public override void Add(CFileElement e) {  Console.WriteLine("Can't add any files under a file!"); } public override void Remove(CFileElement e)  {  Console.WriteLine("Can't remove any sub files!"); } public override void Display() {  Console.WriteLine(this.name); }};

//Class CFolderclass CFolder:CFileElement{ private ArrayList children =new ArrayList();

 public CFolder(string name):base(name){}

 public override void Add(CFileElement e) {  children.Add(e); } public override void Remove(CFileElement e)  {  children.Remove(e); } public override void Display() {  Console.WriteLine(this.name);  foreach(CFileElement e in children)  {   e.Display();  } }

};//----------------------------------Class Element

//TestAppclass TestApp{ public static void Main(string[] args) {     CFolder root = new CFolder("Z:/");  CFolder afolder=new CFolder("Games/");    afolder.Add(new CFile("cstrike.exe"));  root.Add(afolder);        root.Display();  while(true); }};