using System;

using System.Collections;

​

public class Product : IEnumerable

{

    private string[] products;

​

    public Product(string[] products)

    {

        this.products = products;

    }

​

    public IEnumerator GetEnumerator()

    {

        return new ProductEnumerator(products);

    }

}

​

public class ProductEnumerator : IEnumerator

{

    private string[] products;

    private int position = -1;

​

    public ProductEnumerator(string[] products)

    {

        this.products = products;

    }

​

    public object Current

    {

        get

        {

            try

            {

                return products[position];

            }

            catch (IndexOutOfRangeException)

            {

                throw new InvalidOperationException();

            }

        }

    }

​

    public bool MoveNext()

    {

        position++;

        return (position < products.Length);

    }

​

    public void Reset()

    {

        position = -1;

    }

}

​

public class Program

{

    public static void Main()

    {

        string[] products = { "First Product", "Second Product", "Third Product" };

        Product productList = new Product(products);

​

        foreach (string product in productList)

        {

            Console.WriteLine(product);

        }

    }

}

​