private async Task AddNewTorrentAsync(DownloadingFile newSharedFile, bool start)
 {
     filesList.AddLast(newSharedFile);
     if (start && !fileIsDownloading)
     {
         fileIsDownloading = true;
         await newSharedFile.StartAsync().ConfigureAwait(false);
     }
 }
 private async void StartButton_Click(object sender, EventArgs e)
 {
     fileIsDownloading = true;
     await nowSelected.StartAsync().ConfigureAwait(false);
 }