private void Concat_Click(object sender, RoutedEventArgs e)
{
Music first = firstMp3.SelectedItem as Music;
Music second = secondMp3.SelectedItem as Music;
if (first != null && second != null)
{
string[] mp3Paths = new string[] { first.FilePath, second.FilePath };
string pathWithoutExtension = first.FilePath.Split('.')[0];
string outputName = pathWithoutExtension + "+" + second.Name;
musicService.Combine(mp3Paths, outputName, first.DirectoryId);
}
}