using System;

public class Program

{

    public static void Main()

    {

        //Console.WriteLine("Hello World");

        ListColors();

    }

    private static void ListColors()  

    {  

        var colors = new AllColors();  

        foreach (Color theColor in colors)  

        {  

            Console.Write(theColor.Name + " ");  

        }  

    Console.WriteLine();  

    // Output: red blue green  

    } 

}

​

// Collection class.  

public class AllColors : System.Collections.IEnumerable  

{  

    Color[] _colors =  

    {  

        new Color() { Name = "red" },  

        new Color() { Name = "blue" },  

        new Color() { Name = "green" }  

    };  

    public System.Collections.IEnumerator GetEnumerator()  

    {  

        return new ColorEnumerator(_colors);  

        // Instead of creating a custom enumerator, you could  

        // use the GetEnumerator of the array.  

        //return _colors.GetEnumerator();  

    }  

    // Custom enumerator.  

    private class ColorEnumerator : System.Collections.IEnumerator  

    {  

        private Color[] _colors;  

        private int _position = -1;  

        public ColorEnumerator(Color[] colors)  

        {  

            _colors = colors;  

        }  

        object System.Collections.IEnumerator.Current  

        {  

            get  

            {  

                return _colors[_position];  

            }  

        }  

        bool System.Collections.IEnumerator.MoveNext()  

        {  

            _position++;  

            return (_position < _colors.Length);  

        }  

        void System.Collections.IEnumerator.Reset()  

        {  

            _position = -1;  

        }  

    }  

}  

// Element class.  

public class Color  

{  

    public string Name { get; set; }  

}  

​