/// <summary>
/// Method which removes element from playlist and calculates playlist duration
/// </summary>
/// <param name="musicFile">Element to remove</param>
public void Remove(MusicFileViewModel musicFile)
{
musicFileList.Remove(musicFile);
Duration = Duration.Subtract(musicFile.Duration);
}
public void Add(MusicFileViewModel musicFile)
{
musicFileList.Add(musicFile);
Duration = Duration.Add(musicFile.Duration);
}