MP3 TagLib search and copy issue - taglib-sharp

Question

Greetings to all of you.
My problem is:
I need to search through user selected folder that contains MP3 files and check which file(s) has or contains specified tag. If it does, i will copy it to specified folder. I have managed to do something, but only partially, cause for example, i manage to copy genre "Pop" files, but not "Blues" files.
Getting contains to work is a total nightmare, cant get it to work at all.
Code:
try
{
FolderBrowserDialog folder = new FolderBrowserDialog();
DialogResult result = folder.ShowDialog();
string genre = "Blues";
var matchingFiles = Directory.GetFiles(folder.SelectedPath, "*.mp3", SearchOption.AllDirectories).Where(x =>
{
var f = TagLib.File.Create(x);
return (((TagLib.Id3v2.Tag)f.GetTag(TagTypes.Id3v2)).JoinedGenres == genre);
});
foreach (string f in matchingFiles)
{
System.IO.File.Copy(f, Path.Combine(#"destinationFolder", new FileInfo(f).Name));
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
Any help is welcome.
Problem solved:
try
{
FolderBrowserDialog folder = new FolderBrowserDialog();
DialogResult result = folder.ShowDialog();
string upit = search.Text;
var matchingFiles = Directory.GetFiles(folder.SelectedPath, "*.mp3", SearchOption.AllDirectories).Where(x =>
{
var f = TagLib.File.Create(x);
return (((TagLib.Id3v2.Tag)f.GetTag(TagTypes.Id3v2)).Comment != null && ((TagLib.Id3v2.Tag)f.GetTag(TagTypes.Id3v2)).Comment.Contains(upit));
}
);
foreach (string f in matchingFiles)
{
System.IO.File.Copy(f, Path.Combine(path, new FileInfo(f).Name));
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message + "\n" + ex.StackTrace);
}