private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e) //writing to xml file, if program is closing
{
WorkWithFiles w = new WorkWithFiles();
w.writeSongsToFile(musicLibrary);
w.writePlaylistsToFile(playlists);
}
static void read() //read from file
{
WorkWithFiles w = new WorkWithFiles();
w.readSongsFromFile();
musicLibrary = w.ReadSongsCollection;
w.readPlaylistsFromFile();
playlists = w.ReadPlaylistsCollection;
}