using System;

using System.Collections.Generic;

​

public class Program

{

    private static Random r = new Random();

​

    private static IEnumerable<int> RandomNumbers(int count, int max) {

      for(int i = 0; i < count; i ++) {

          yield return r.Next(max);

      }

    }

​

    public static void Main()

    {

        var numbers = RandomNumbers(5, 10);

​

        // Enumerate ONCE

        foreach(var number in numbers) {

           Console.WriteLine(number);

        }

​

        // Enumerate AGAIN

        foreach(var number in numbers) {

           Console.WriteLine(number);

        }   

    }

}

​