//https://docs.microsoft.com/en-us/uwp/api/windows.storage.storagefolder
        private async void New_PlayList_Click(object sender, RoutedEventArgs e)
        {
            NewPlayListDialog newPlayList = new NewPlayListDialog();
            await newPlayList.ShowAsync();

            if (newPlayList.result == null)
            {
            }
            else
            {
                StorageFolder newFolder = await currentFolder.CreateFolderAsync(newPlayList.result, CreationCollisionOption.FailIfExists);

                BuildPlaylists();
            }
        }
        private async void Rename_Playlist_Click(object sender, RoutedEventArgs e)
        {
            NewPlayListDialog newPlayList = new NewPlayListDialog();
            await newPlayList.ShowAsync();

            if (newPlayList.result == null)
            {
            }
            else
            {
                StorageFolder folder = await currentFolder.GetFolderAsync(playList.SelectedItem.ToString());

                await folder.RenameAsync(newPlayList.result);

                BuildPlaylists();
            }
        }
        private async void rename_Video_Click(object sender, RoutedEventArgs e)
        {
            StorageFolder playlist = await currentFolder.GetFolderAsync(playList.SelectedItem.ToString());

            StorageFile video = await playlist.GetFileAsync(videoList.SelectedItem.ToString() + ".mp4");

            NewPlayListDialog rename = new NewPlayListDialog();
            await rename.ShowAsync();

            if (rename.result == null)
            {
            }
            else
            {
                await video.RenameAsync(rename.result + ".mp4");
            }

            BuildVideoList();
        }