using System;
 using System.Collections;


 public class EnumerableArrayList : IEnumerable
 {
  ArrayList al;
  public EnumerableArrayList()
  {
   this.al = new ArrayList();
   al.Add("Christoph");
   al.Add("Christian");
  }


  public IEnumerator GetEnumerator()
  {
   return new MyEnumerator(this.al);
  }


  class MyEnumerator : IEnumerator
  {
   ArrayList al;
   int index;


   public MyEnumerator(ArrayList al)
   {
    this.al = al;
    index = -1;
   }


   public object Current {
    get
    {
     return al[index];
    }
   }


   public bool MoveNext()
   {
    index++;
    if (index >= al.Count) return false;
    return true;
   }


   public void Reset()
   {
    index = -1;
   }
  }
 }


 class MainClass
 {
  public static void Main(string[] args)
  {
   EnumerableArrayList mal = new EnumerableArrayList();


   foreach (object obj in mal)
    Console.WriteLine(obj);
  }
 }