private async void button_like_Click(object sender, EventArgs e) { if (listview_data.SelectedItems.Count > 0) { int index = listview_data.Items.IndexOf(listview_data.SelectedItems[0]); InfoProvider ipop = new InfoProvider(); await ipop.makeLike(this._SongList[index]._SongID); this.refreshLikeInfo(this._SongList[index]._SongID); } }