using System;

using System.Collections;       

​

public class Program

{

    public static void Main()

    {

        var enumerator = new ThreeNumbersEnumerator(3, 1, 4);

        while (enumerator.MoveNext())

        {

            Console.WriteLine(enumerator.Current);

        }

        // this no worky

        foreach (var item in enumerator)

        {

​

        }

    }

}

​

public class ThreeNumbersEnumerator : IEnumerator

{

    private int[] items = null;

    private int currentIndex = -1;

​

    public ThreeNumbersEnumerator(int a, int b, int c)

    {

        this.items = new int[3] { a, b, c };

    }

​

    public object Current

    {

        get

        {

            return this.items[this.currentIndex];

        }

    }

​

    public bool MoveNext()

    {

        this.currentIndex += 1;

​

        return this.currentIndex < this.items.Length;

    }

​

​

    public void Reset()

    {

        this.currentIndex = -1;

    }

}