C#: System.Collections.IEnumerable: Custom Iterator Example

gistfile1.cs

using System;

namespace IteratorsExample {
    class Program {
        static void Main(string[] args) {
            // Create an instance of the collection class
            EvenIntegers ei = new EvenIntegers();

            // Iterate with foreach
            foreach ( int num in ei ) {
                System.Console.Write( num + " " );
            }

            // Allow user to read output
            Console.Read();
        }
    }

    public class EvenIntegers : System.Collections.IEnumerable {
        public System.Collections.IEnumerator GetEnumerator() {
            for ( int i = 0 ; i < 11 ; i=i+2 ) {
                yield return i;
            }
        }
    }
}