using System;

using System.Collections.Generic;

​

public class Program

{

    public static IEnumerable<int> InfiniteCounter(int i)

    {

        while (true)

        {

            yield return i;

​

            i++;

        }

    }

​

    public static void Main()

    {

        foreach (var i in InfiniteCounter(10))

        {

            Console.WriteLine(i);

​

            if (i >= 15)

            {

                break;

            }

        }

    }

}