private void lstAlbums_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            MusicEntity music = (MusicEntity)lstAlbums.SelectedItems[0];

            txt_AlbumName.Text  = music.AlbumName;
            txt_NoOfTracks.Text = music.NoOfTracks.ToString();
            txt_Price.Text      = music.Price.ToString();
        }
        private void btnAddAlbum_Click(object sender, RoutedEventArgs e)
        {
            MusicEntity m = new MusicEntity();

            m.AlbumName  = txtAlbumName.Text;
            m.NoOfTracks = int.Parse(txtNoOfTracks.Text);
            m.Price      = int.Parse(txtPrice.Text);
            lstAlbums.Items.Add(m);
        }