How to get the Youtube VideoId from Url and generate image thumbnail in C#

To get the Youtube VideoId from an Url enerate image thumbnail in C#  you can use the following snippet.

Sample Input

http://youtu.be/AAAAAAAAA01

http://www.youtube.com/embed/watch?feature=player_embedded&v=AAAAAAAAA02

http://www.youtube.com/embed/watch?v=AAAAAAAAA03

http://www.youtube.com/embed/v=AAAAAAAAA04

http://www.youtube.com/watch?v=AAAAAAAAA06

www.youtube.com/watch?v=AAAAAAAAA07

www.youtu.be/AAAAAAAAA08

youtu.be/AAAAAAAAA09

http://www.youtube.com/watch?feature=player_embedded&v=AAAAAAAAA05

http://www.youtube.com/watch?v=i-AAAAAAA14&feature=related

http://www.youtube.com/attribution_link?u=/watch?v=AAAAAAAAA15&feature=share&a=9QlmP1yvjcllp0h3l0NwuA

http://www.youtube.com/attribution_link?a=fF1CWYwxCQ4&u=/watch?v=AAAAAAAAA16&feature=em-uploademail

http://www.youtube.com/attribution_link?a=fF1CWYwxCQ4&feature=em-uploademail&u=/watch?v=AAAAAAAAA17

http://www.youtube.com/v/A-AAAAAAA18?fs=1&rel=0

youtube.com/watch?v=AAAAAAAAA10

http://www.youtube.com/watch/AAAAAAAAA11

http://www.youtube.com/v/AAAAAAAAA12

http://www.youtube.com/v/AAAAAAAAA13

  /// <summary>
  ///  Method to reslove the youtube urls into image URL
  /// </summary>
  /// <param name="youtubeUrl"></param>
  /// <returns>imageURL</returns>
  public string GetYouTubeThumbnail(string youtubeUrl)
    {
      string imageURL = string.Empty;
      string youTubeThumb = string.Empty;
      if (youtubeUrl == "")
        return "";
      if (youtubeUrl.IndexOf("/embed/") > 0)
      {
        string strVideoCode = youtubeUrl.Substring(youtubeUrl.IndexOf("/embed/") + 7);
        int ind = strVideoCode.IndexOf("?");
        youTubeThumb = strVideoCode.Substring(0, ind == -1 ? strVideoCode.Length : ind);
      }
      else if (youtubeUrl.IndexOf("v=") > 0)
      {
        string strVideoCode = youtubeUrl.Substring(youtubeUrl.IndexOf("v=") + 2);
        int ind = strVideoCode.IndexOf("?");
        youTubeThumb = strVideoCode.Substring(0, ind == -1 ? strVideoCode.Length : ind);
      }
      
      else if (youtubeUrl.IndexOf("/v/") > 0)
      {
        string strVideoCode = youtubeUrl.Substring(youtubeUrl.IndexOf("/v/") + 3);
        int ind = strVideoCode.IndexOf("?");
        youTubeThumb = strVideoCode.Substring(0, ind == -1 ? strVideoCode.Length : ind);
      }
      else if (youtubeUrl.IndexOf("/") > 6)
      {
        youTubeThumb = youtubeUrl.Split('/')[1];
      }
      
      if (youTubeThumb != string.Empty && youTubeThumb != "" && youTubeThumb != null)
      {
        imageURL = "http://img.youtube.com/vi/" + youTubeThumb + "/mqdefault.jpg";
      }
      return imageURL;
    }    

About MVC In ASP.NET :

MVC stands for model-view-controller.  MVC is a pattern for developing applications that are well architected, testable  and easy to maintain. MVC-based applications contain:

• Models: Classes that represent the data of the application  and that use validation logic to enforce business rules for that data.
• Views: Template files that your application uses to dynamically  generate HTML responses.
• Controllers: Classes that handle incoming browser requests,  retrieve model data, and then specify view templates that return a response  to the browser.