using System;

using System.Collections;

using System.Collections.Generic;

public class Program

{

    static List<int> numbers = new List<int>();

    public static void Main()

    {

        // Make a list of 100 random numbers between 0 and 1024

        var rand = new System.Random();

        for(var i = 0; i < 100; i++) 

        {

            numbers.Add(rand.Next(0, 1024));

        }

        var threshold = 512;

        var numberEnumerator = GreaterThan(threshold);

        Console.WriteLine("Numbers greater than " + threshold);

        while(numberEnumerator.MoveNext()) // continues execution of the IEnumerator till it hits the next yield statement and populates it's Current value.

        {

            // Must cast as Current is type System.Object because you can yield anything.

            // It's up to the IEnumerator consumer to know how to handle the current item.

            var number = (int)numberEnumerator.Current; 

            Console.WriteLine(number);

        }

        Console.WriteLine("Program complete");

​

    }

    public static IEnumerator GreaterThan(int value) 

    {

        foreach(var number in numbers) 

        {

            if (number > value) 

            {

                Console.WriteLine("Found a good number");

                yield return number;

            }

        }

    }

}