private async Task doInsertAsync(int opt) { var tokenSource2 = new CancellationTokenSource(); CancellationToken ct = tokenSource2.Token; try { await FirebaseHelper.AddUser(entryName.Text, entryApellidos.Text, entryDNI.Text, "12345", opt); } catch (OperationCanceledException e) { Console.WriteLine($"{nameof(OperationCanceledException)} thrown with message: {e.Message}"); } finally { tokenSource2.Dispose(); Navigation.PopModalAsync(); } }