using System;
using System.Collections.Generic;
using System.Linq;

class FiveDigits
{
    HashSet<int> hash = new HashSet<int>();
    Random rng = new Random();

    public void play(){
        int magicNumber = 12345;
        int counter = 0;

        while (!hash.Contains( magicNumber))
        {
            getNewNumber();
            Console.WriteLine("Iteration #{0,4} with combination = {1}", counter+1, hash.ElementAt(counter).ToString("D5"));
            counter++;
            if (counter % 10 == 0) pause();
        }
        Console.ReadKey();
    }
    public void pause()
    {
        Console.WriteLine("Press any key to continue . . .");
        Console.ReadKey(true);
    }
    public void getNewNumber()
    {
        while ( !hash.Add(rng.Next(0, 99999))) ;
    }
}