using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static IEnumerable<string> IteratorMethod()

    {

        Console.WriteLine("start of iterator method");

​

        yield return "first and only value";

        Console.WriteLine("end of iterator method");

    }

    public static void Main()

    {

        var values = IteratorMethod();

        if (values.Any())

        {

            foreach (var val in values)

            {

                Console.WriteLine(val);

            }

        }

    }

}