private async void ContinuousRecognitionSession_ResultGenerated(SpeechContinuousRecognitionSession sender, SpeechContinuousRecognitionResultGeneratedEventArgs args)
        {
            if (!this.Completed)
            {
                try
                {
                    //sender.StopAsync();
                    //this.Completed = true;
                    sender.CancelAsync();
                }
                catch (Exception)
                {
                }
                await this.Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
                {
                    var mensaje = args.Result.Text.Replace(".", string.Empty);
                    if (mensaje.Contains("Text"))
                    {
                        mensaje = "Texto";
                    }
                    var vm = new ImageSearchViewModel();
                    // mensaje = "Texto";
                    vm.Search(mensaje);
                    if (vm.SearchResult.Count > 0)
                    {
                        Frame.Navigate(typeof(SearchListView), vm);
                    }
                    else
                    {
                        var auth       = new Authentication("713034f5c7994f089c1d5a70c1a12ede", "54c4cd393679455d90a48250cde0cfa4");
                        var token      = auth.GetAccessToken();
                        var requestUri = "https://speech.platform.bing.com/synthesize";

                        var sb = new StringBuilder();
                        sb.AppendFormat("No se han encontrado resultados de búsqueda.");

                        var cortana = new Synthesize(new Synthesize.InputOptions()
                        {
                            RequestUri         = new Uri(requestUri),
                            Text               = sb.ToString(),
                            VoiceType          = Gender.Female,
                            Locale             = "es-es",
                            VoiceName          = "Microsoft Server Speech Text to Speech Voice (en-US, ZiraRUS)",
                            OutputFormat       = AudioOutputFormat.Riff16Khz16BitMonoPcm,
                            AuthorizationToken = "Bearer " + token.access_token,
                        });

                        cortana.OnAudioAvailable += PlayAudio;
                        cortana.OnError          += ErrorHandler;
                        cortana.Speak(CancellationToken.None);
                        cortana = null;
                    }
                });
            }
        }