using System;

using System.Collections.Generic;

​

public class Program

{

    // Iterator method:

    static IEnumerable<string> Iterator()

    {

        try

        {

            Console.WriteLine("Before first yield");

            yield return "first";

            Console.WriteLine("Between yields");

            yield return "second";

            Console.WriteLine("After second yield");

        }

        finally

        {

            Console.WriteLine("In finally block"); // This will execute only at the end, when we stop iterating!

        }

    }

​

    public static void Main()

    {

        IEnumerable<string> enumerable = Iterator();

        using (IEnumerator<string> enumerator = enumerable.GetEnumerator()) // It is important to have this "using" - without it, the Dispose (and finally block) wouldn't execute.

        {

            while (enumerator.MoveNext())

            {

                string value = enumerator.Current;

                Console.WriteLine("Received value: {0}", value);

                if (value != null)

                {

                    break;

                }

            }

        }

    }

}