using System;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        foreach (var number in GetNumbers())

        {

            Console.WriteLine(number);

        }

    }

​

    public static IEnumerable<int> GetNumbers()

    {

        int i = 0;

        while (true)

        {

            if (i < 10)

            {

                yield return i++;

            }

            else

            {

                yield break;

            }

        }

​

        Console.WriteLine("This line will not be executed");

    }

}