//MyComposite
using System;
using System.Collections;

//----------------------------------Class FileElement
abstract 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 CFile
class 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 CFolder
class 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

//TestApp
class 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);
}
};