Youtube Download Klasse für C#

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Text.RegularExpressions;
using System.Web;

class YoutubeDownload
{
    public YoutubeDownload()
    {
        webClient.DownloadProgressChanged += new DownloadProgressChangedEventHandler(webClient_DownloadProgressChanged);
        webClient.DownloadFileCompleted += new System.ComponentModel.AsyncCompletedEventHandler(webClient_DownloadFileCompleted);
    }

    private WebClient webClient = new WebClient();

    public delegate void DownloadVideoCompletedEventhandler(object sender, System.ComponentModel.AsyncCompletedEventArgs e);
    public event DownloadVideoCompletedEventhandler DownloadVideoCompleted;

    public delegate void DownloadVideoProgressChangedEventhandler(object sender, DownloadProgressChangedEventArgs e);
    public event DownloadVideoProgressChangedEventhandler DownloadVideoProgressChanged;

    public string GetYoutubeUrl(string youtubeUrl)
    {
        string flashvars = "";
        string fmt_stream_map = "";
        string[] seperator = { "%7C" };

        Regex flashvarsRegex = new Regex("(?<flashvars>flashvars=\".*\")");
        Regex fmt_stream_mapRegex = new Regex("(?<fmt_stream_map>fmt_stream_map=.*\")");

        flashvars = flashvarsRegex.Match(webClient.DownloadString(youtubeUrl)).Groups["flashvars"].Value;

        fmt_stream_map = fmt_stream_mapRegex.Match(flashvars).Groups["fmt_stream_map"].Value;

        return HttpUtility.UrlDecode(fmt_stream_map.Split(seperator, StringSplitOptions.RemoveEmptyEntries)[5]);
    }

    public void DownloadVideo(string downloadUrl, string fullFilename)
    {
        webClient.DownloadFileAsync(new Uri(downloadUrl), fullFilename);
    }

    private void webClient_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
    {
        if (DownloadVideoProgressChanged != null)
        {
            DownloadVideoProgressChanged(sender, e);
        }
    }

    private void webClient_DownloadFileCompleted(object sender, System.ComponentModel.AsyncCompletedEventArgs e)
    {
        if (DownloadVideoCompleted != null)
        {
            DownloadVideoCompleted(sender, e);
        }
    }

    public string GetVideoTitle(string youtubeUrl)
    {
        Regex titleRegex = new Regex("title=\".*\"");

        string title = titleRegex.Match(webClient.DownloadString(youtubeUrl)).NextMatch().Value;

        title = title.Replace("title=\"", "");

        title = title.Remove((title.Length - 1), 1);

        return title;
    }
}