using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var numbers = TestYield(5);

        Console.WriteLine("Caller: about to iterate.");

        foreach (int i in numbers)

        {

            Console.WriteLine("Caller: {0}", i);

        }

​

    }

​

    static IEnumerable<int> TestYield(int upto)

    {

        using (new D())

        {       

            Console.WriteLine("Iterator: start.");

            for (int i=0; i<10; i++)

            {

                yield return i;

            }

            Console.WriteLine("Iterator: end.");

        }

    }

    class D : IDisposable

    {

        public void Dispose()

        {

            Console.WriteLine("Dispose");

        }

    }

}