using System;

using System.Collections;

using System.Linq;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        var numbers = (new int[]{0, 1, 2, 3, 4, 5}).AsEnumerable();

        var numberEnumerator = numbers.GetEnumerator();

        for (int i = 0; i < 22; i++)

        {

            var number = NextInRotation<int>(numberEnumerator);

            Console.WriteLine(number);

        }

    }

​

    private static T NextInRotation<T>(IEnumerator<T> enumerator)

    {

        if (!enumerator.MoveNext())

        {

            enumerator.Reset();

            // enumerator needs an initial moveNext() to point current to the first element

            enumerator.MoveNext();

        }

​

        return enumerator.Current;

    }

}