My Composite in C#

//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);
 }
};

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