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YouTube Downloader Using C# .NET

, 22 Dec 2014 CPOL
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Full C# code to download videos from YouTube in any quality.

Downloader works again Smile | :)


This tip shows how to download YouTube videos using C# code only. The code is very simple to understand and anyone can easily integrate it in their solution or project.

I didn't use any third party library to do this task. All you need is to take two .cs files and integrate them to your project.

Using the Code

There are two main classes in this project:

YouTubeVideoQuality Class

This is the entity that describes the video.

public class YouTubeVideoQuality 
    /// <summary>
    /// Gets or Sets the file name
    /// </summary>
    public string VideoTitle { get; set; }
    /// <summary>
    /// Gets or Sets the file extension
    /// </summary>
    public string Extention { get; set; }
    /// <summary>
    /// Gets or Sets the file url
    /// </summary>
    public string DownloadUrl { get; set; }
    /// <summary>
    /// Gets or Sets the youtube video url
    /// </summary>
    public string VideoUrl { get; set; }
    /// <summary>
    /// Gets or Sets the file size
    /// </summary>
    public Size Dimension { get; set; }

    public override string ToString()
        return Extention + " File " + Dimension.Width + 
                           "x" + Dimension.Height;

    public void SetQuality(string Extention, Size Dimension)
        this.Extention = Extention;
        this.Dimension = Dimension;

YouTubeDownloader Class

This class downloads YouTube videos:

public class YouTubeDownloader
    public static List<YouTubeVideoQuality> GetYouTubeVideoUrls(params string[] VideoUrls)
        List<YouTubeVideoQuality> urls = new List<YouTubeVideoQuality>();
        foreach (var VideoUrl in VideoUrls)
            string html = Helper.DownloadWebPage(VideoUrl);
            string title = GetTitle(html);
            foreach (var videoLink in ExtractUrls(html))
                YouTubeVideoQuality q = new YouTubeVideoQuality();
                q.VideoUrl = VideoUrl;
                q.VideoTitle = title;
                q.DownloadUrl = videoLink + "&title=" + title;
                if (getQuality(q))
        return urls;

    private static string GetTitle(string RssDoc)
        string str14 = Helper.GetTxtBtwn(RssDoc, "'VIDEO_TITLE': '", "'", 0);
        if (str14 == "") str14 = 
        Helper.GetTxtBtwn(RssDoc, "\"title\" content=\"", "\"", 0);
        if (str14 == "") str14 = 
        Helper.GetTxtBtwn(RssDoc, "&title=", "&", 0);
        str14 = str14.Replace(@"\", "").Replace("'", "&#39;").Replace(
                "\"", "&quot;").Replace("<", "&lt;").Replace(
                ">", "&gt;").Replace("+", " ");
        return str14;

    private static List<string> ExtractUrls(string html)
        html = Uri.UnescapeDataString(Regex.Match(html, "url_encoded_fmt_stream_map=(.+?)&", 
        MatchCollection matchs = Regex.Matches(html, 
        bool firstTry = matchs.Count > 0;
        if (!firstTry)
            matchs = Regex.Matches(html, 
        List<string> urls = new List<string>();
        foreach (Match match in matchs)
            if (firstTry)
                urls.Add(Uri.UnescapeDataString(match.Groups[1] + ""));
            else urls.Add(Uri.UnescapeDataString(match.Groups[2] + "") + 
            "&signature=" + match.Groups[5]);
        return urls;

    private static bool getQuality(YouTubeVideoQuality q)
        if (q.DownloadUrl.Contains("itag=5"))
            q.SetQuality("flv", new Size(320, 240));
        else if (q.DownloadUrl.Contains("itag=34"))
            q.SetQuality("flv", new Size(400, 226));
        else if (q.DownloadUrl.Contains("itag=6"))
            q.SetQuality("flv", new Size(480, 360));
        else if (q.DownloadUrl.Contains("itag=35"))
            q.SetQuality("flv", new Size(640, 380));
        else if (q.DownloadUrl.Contains("itag=18"))
            q.SetQuality("mp4", new Size(480, 360));
        else if (q.DownloadUrl.Contains("itag=22"))
            q.SetQuality("mp4", new Size(1280, 720));
        else if (q.DownloadUrl.Contains("itag=37"))
            q.SetQuality("mp4", new Size(1920, 1280));
        else if (q.DownloadUrl.Contains("itag=38"))
            q.SetQuality("mp4", new Size(4096, 72304));
        else return false;
        return true;

Points of Interest

Using this code, you can select the video quality depending on your internet connection speed to start download.

Many people have slow internet connections and they cannot watch videos from YouTube, so I made this code to help those people to download YouTube videos to their PCs so they can watch the videos offline.


Thanks to Motaz Alnuweiri, the Downloader works again. Added self download videos.


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Software Developer Desktop Team
Palestinian Territory (Occupied) Palestinian Territory (Occupied)
I have advanced skills in desktop apps development, i have built many apps for many corporations.
i'm using the follow languages in my work:
1- C# Language.
2- VB6 Language.
3- using C#.
4- Crystal Reports.
i have more than 7 experience years in coding and programming.
Systems and apps Developed by Us:
1-E-Archive System (VB6,Supports multi DataBase Engins).
2-SMS System (Multi languages such VB6,C#,Asp.Net and Gizmox).
3-Multi Camera Monitor System-Motion Detection and record(C#).
4-Administrative Evaluation System (
5-E-Clinic System (C#-using my business layer generator,Supports multi DataBase Engines).
6-Data Access Layer Generator Framework(C#).
7-Sip Provider -VOIP- Softphone (C#- for Italian company).
8-Training course Manager System(C#-for UCAS).
9-Computer Exam System (VB6,Oracle DataBase).
10-Dialer System (VB6).
11-Implement Google API using C# (Translation and web Search).
12-Print Management Enterprise(C#)
13-Elections System (C#- using my business layer generator).
14-Advanced English competition (VB6).
15-Remote USB Sharing (C/C++,VB6).
16-Watch Attendance (C/C++,VB6).
17-Tube Spy (C#).
18-AdminYourTube (C#)
19- Transport Reservation System (C#,,Ajax,Jquery)
Please visit my elance URL

Comments and Discussions

GeneralRe: The code works, but you need to send User Agent while requesting getSize PinmemberakramKamal13-Jan-13 1:39 
GeneralRe: The code works, but you need to send User Agent while requesting getSize PinmemberVincenzo Lo Palo9-Feb-13 6:37 
QuestionLink error Pinmemberbzsolt916-Jan-13 18:04 
AnswerRe: Link error PinmemberCircleDock6-Jan-13 20:09 
GeneralMy vote of 4 PinmemberJai Mallesh1-Jan-13 1:45 
GeneralRe: My vote of 4 PinmemberakramKamal1-Jan-13 4:32 
QuestionRe: My vote of 4 PinmemberEmpire44310-Feb-13 10:36 
QuestionNew Version Posted PinmemberakramKamal28-Dec-12 11:49 
Hi everyone
I am sorry for being late, i was very busy, i have a big project in my hand.
I posted a new working version taking in my account all the useful comments from you people; waiting for the code project team to approve it.
I really thankful for all users who take care of my software and i hope always i have this concern.
AnswerRe: New Version Posted [modified] PinmemberDiabloPB29-Dec-12 1:00 
NewsRe: New Version Posted PinmemberMotaz Alnuweiri29-Dec-12 4:51 
GeneralRe: New Version Posted PinmemberDiabloPB29-Dec-12 6:06 
GeneralRe: New Version Posted PinmemberakramKamal29-Dec-12 4:57 
QuestionNot working Pinmemberkabila28-Dec-12 5:42 
BugDEC 25 version not working for me PinmemberTheFigmo27-Dec-12 11:01 
GeneralRe: DEC 25 version not working for me PinmemberDiabloPB27-Dec-12 12:26 
GeneralRe: DEC 25 version not working for me PinmemberCircleDock27-Dec-12 20:21 
GeneralRe: DEC 25 version not working for me PinmemberTheFigmo28-Dec-12 7:26 
GeneralRe: DEC 25 version not working for me PinmemberCircleDock28-Dec-12 8:47 
GeneralRe: DEC 25 version not working for me PinmemberTheFigmo28-Dec-12 9:21 
QuestionMP3 Pinmembermaltra26-Dec-12 9:54 
AnswerRe: MP3 PinmemberCircleDock27-Dec-12 20:39 
Questionitag values corrected - but a problem remains... [modified] PinmemberCircleDock24-Dec-12 22:40 
AnswerRe: itag values corrected - but a problem remains... PinmemberakramKamal25-Dec-12 9:57 
GeneralRe: itag values corrected - but a problem remains... PinmemberMotaz Alnuweiri26-Dec-12 1:19 
GeneralRe: itag values corrected - but a problem remains... PinmemberakramKamal28-Dec-12 11:53 

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