private void AddUploadHandle(TransferHandle h)
 {
     Invoke(() => Transfers.Add(h));
     h.PropertyChanged += (source, e) =>
     {
         if (e.PropertyName == "Status")
         {
             if (((TransferHandle)source).Status == TransferHandleStatus.Uploading)
             {
                 Status = ConnectivityStatus.Uploading;
             }
             else
             {
                 if (Transfers.All(t => t.Status == TransferHandleStatus.Success || t.Status == TransferHandleStatus.Cancelled || t.Status == TransferHandleStatus.Error))
                 {
                     Status = ConnectivityStatus.Online;
                 }
             }
         }
     };
     h.TransferEnded += (s1, e1) =>
     {
         AppendNode(h.Node);
     };
 }
 private void AddDownloadHandle(TransferHandle h)
 {
     Invoke(() => Transfers.Add(h));
     h.TransferEnded += (s1, e1) =>
     {
         if (Transfers.All(t => t.Progress >= 100))
         {
             Status = ConnectivityStatus.Online;
         }
     };
 }