MainForm.cs

using System;
using System.IO;
using System.Media;
using System.Reflection;
using System.Threading.Tasks;
using System.Windows.Forms;
using AzgalorStatusCheckerWinform.Properties;
using ServerStatusCrawler;
using Timer = System.Threading.Timer;

namespace AzgalorStatusCheckerWinform
{
    public partial class mainForm : Form
    {
        private ServerState _serverState;
        private Timer timer;

        public mainForm()
        {
            InitializeComponent();
            statusPictureBox.Image = Resources.unknown;
            _serverState = ServerState.UNKNOWN;

            Run();
        }

        private void updateLastTimeCheckedLabel()
        {
            lblLastTimeCheckedValue.Text = Task.Run(() => DateTime.Now.ToLongTimeString()).Result;
        }

        private async void checkStatus()
        {
            var crawler = new AsyncCrawler(new WowServerStatusCrawler("Azgalor", new WowServerStatusParser()));
            await UpdatePictureBox(crawler);
            await updateCheckedTime();
        }

        private async Task UpdatePictureBox(AsyncCrawler crawler)
        {
            bool newState = await crawler.IsServerUp();
            await Task.Run(() => setServerState(newState));
        }

        private void setServerState(bool newState)
        {
                statusPictureBox.Image = newState ? Resources.online : Resources.offline;
                if ((_serverState == ServerState.OFFLINE) && newState)
                {
                    new SoundPlayer(Assembly.GetExecutingAssembly().GetManifestResourceStream
                                        ("AzgalorStatusCheckerWinform.leeroy.wav")).Play();
                }

                _serverState = newState ? ServerState.ONLINE : ServerState.OFFLINE;
        }

        private async Task updateCheckedTime()
        {
            await Task.Run(() => updateLastTimeCheckedLabel());
        }

        private void Run()
        {
            timer = new Timer(TimerCallback, null, 0, 5000);
        }

        private void TimerCallback(object state)
        {
            checkStatus();
        }

        private enum ServerState
        {
            ONLINE,
            OFFLINE,
            UNKNOWN
        }
    }
}