private async void InitDefaultRecognizerAsync() { if (!_recognizerInitialized) { var webSearchGrammar = new Windows.Media.SpeechRecognition.SpeechRecognitionTopicConstraint(Windows.Media.SpeechRecognition.SpeechRecognitionScenario.WebSearch, "webSearch"); Recognizer.Constraints.Add(webSearchGrammar); await Recognizer.CompileConstraintsAsync(); _recognizerInitialized = true; } }