Apply album art using Taglib# from a URL

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C#

WPF

picturebox

greetings,
I am a newbie. I am designing a small windows forms application for editing the id3 tags in mp3 files. I am using TagLib# for this purpose. I am able to search for the album art of the song from the Last.fm API and load it into a picture box for the user to see using a webrequest. But when I try to apply the Image to the song using it's URL then it shows the error "cannot use URL".
Here's My code.
PLEASE HELP!!

 private void searcher_Click(object sender, EventArgs e)
       {
           string ApiKey = "****************************";
           string LastFMLogin = "**************";
           Lastfm.Services.Session session = new Lastfm.Services.Session(ApiKey,LastFMLogin);
           Lastfm.Services.Artist lArtist = new Lastfm.Services.Artist(artist2.Text,session);
           Lastfm.Services.Album lAlbum = new Lastfm.Services.Album(lArtist,album2.Text,session);
           textBox5.Text = AbsUrlOfArt(album2.Text, artist2.Text);
           p5.ImageLocation = textBox5.Text;

       }

 private void set_Click(object sender, EventArgs e)
       {

           TagLib.File f6 = TagLib.File.Create(path2[songlist.SelectedIndex]);
           IPicture[] pictures = new IPicture[1];
           pictures[0] = new Picture(p5.ImageLocation);
           f6.Tag.Pictures = pictures;
       }

public static string AbsUrlOfArt(string album, string artist)
       {
           string ApiKey = "****************************";
           string LastFMLogin = "**************";
           Lastfm.Services.Session session = new Lastfm.Services.Session(ApiKey,LastFMLogin);
           Lastfm.Services.Artist lArtist = new Lastfm.Services.Artist(artist, session);
           Lastfm.Services.Album lAlbum = new Lastfm.Services.Album(lArtist, album, session);
           return lAlbum.GetImageURL(AlbumImageSize.ExtraLarge);


       }

       public static System.Drawing.Image AlbumArt(string album, string artist)
       {
           Stream stream = null;
           try
           {

               WebRequest req = WebRequest.Create(AbsUrlOfArt(album, artist));
               WebResponse response = req.GetResponse();
               stream = response.GetResponseStream();
               Image img = Image.FromStream(stream);
               return img;
           }

           catch (Exception e)
           {
               return null;
           }

           finally
           {
               if (stream != null)
                   stream.Dispose();
           }

       }