using System;

public class Program

{

    private String ErrCode()

    {

        //make errors more random

        System.Threading.Thread.Sleep(20);

        Random rnd = new Random();

        int errCode = rnd.Next(12000, 34000);       

        return "0x0000" + errCode.ToString("X") + (errCode+5678).ToString("X");

    }

    public void Main()

    {

        Console.WriteLine(ErrCode());

        Console.WriteLine(ErrCode());

        Console.WriteLine(ErrCode());

​

    }

}