Program na testování rychlosti internetu a jeho stability po delší dobu

Program.cs

using System;
using System.ComponentModel;
using System.Diagnostics;
using System.IO;
using System.Net;
using System.Threading;

namespace SpeedtestLog
{
    class MainClass
    {
        static WebClient webClient;
        static Stopwatch sw = new Stopwatch();
        public static int total = 0;
        public static string url = "http://35.242.207.92/largefile.iso";
        public static string totaldownloaded = "";
        public static long downloaded = 0;
        public static long lastdownloaded = 0;

        public static void DownloadFile(string urlAddress, string location)
        {
            using (webClient = new WebClient())
            {
                webClient.DownloadFileCompleted += new AsyncCompletedEventHandler(Completed);
                webClient.DownloadProgressChanged += new DownloadProgressChangedEventHandler(ProgressChanged);

                Uri URL = new Uri(url);

                sw.Start();

                try
                {
                    webClient.DownloadFileAsync(URL, location);
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                }
            }
        }

        private static void ProgressChanged(object sender, DownloadProgressChangedEventArgs e)
        {
            totaldownloaded = string.Format("{0} MB's / {1} MB's",
                (e.BytesReceived / 1024d / 1024d).ToString("0.00"),
                (e.TotalBytesToReceive / 1024d / 1024d).ToString("0.00"));
            downloaded = e.BytesReceived;
        }

        private static void Completed(object sender, AsyncCompletedEventArgs e)
        {
            sw.Reset();

            if (e.Cancelled == true)
            {
                Console.WriteLine("Download has been canceled.");
            }
            else
            {
                Console.WriteLine("--> " + total.ToString() + " <--");
                DownloadFile(url, "file.iso");
                total++;
            }
        }

        private static void TimerCallback(Object o)
        {

            long speedl = downloaded - lastdownloaded;
            string speed = speedl.ToString();
            lastdownloaded = downloaded;
            Console.WriteLine(speed + " (" + totaldownloaded + ")");
            File.AppendAllText("log.txt", speed + Environment.NewLine);
        }

        public static void Main(string[] args)
        {
            Timer t = new Timer(TimerCallback, null, 0, 1000);
            DownloadFile(url, "file.iso");
            Console.ReadKey();
        }
    }
}