using System;

using System.Collections.Generic;

​

namespace DuckTyping

{

  class Collection

  {

    public Enumerator GetEnumerator()

    {

      return new Enumerator();

    }

  }

​

  class Enumerator

  {

    private int _current=0;

​

    public object Current

    {

      get { return "Enumerator.Current "+_current.ToString(); }

    }

​

    public bool MoveNext()

    {

        _current++;

        if (_current>10) return false;

        return true;

    }

  }

​

  public class Program

  {

    public static void Main()

    {

      foreach(object o in new Collection())

        Console.WriteLine(o);

    }

  }

}