App.xaml.cs

protected override void OnActivated(IActivatedEventArgs args)
{
    base.OnActivated(args);
    string infos = string.Empty;

    // Get voice data
    if (args.Kind == ActivationKind.VoiceCommand)
    {                
        var commandArgs = args as VoiceCommandActivatedEventArgs;
        var speechRecognitionResult = commandArgs.Result;
        var commandName = speechRecognitionResult.RulePath[0];

        switch (commandName)
        {
            case "switchLightOn":
                var room = speechRecognitionResult.SemanticInterpretation.Properties["room"][0];
                var status = speechRecognitionResult.SemanticInterpretation.Properties["status"][0];
                infos =  room + "|" + status;
                break;
        }
    }

    // Prepare frame
    Frame rootFrame = Window.Current.Content as Frame;
    if (rootFrame == null)
    {
        rootFrame = new Frame();
        rootFrame.NavigationFailed += OnNavigationFailed;
        Window.Current.Content = rootFrame;
        RestoreSavedSettings();
    }            

    // Navigate and pass information
    rootFrame.Navigate(typeof(MainPage), infos);
    Window.Current.Activate();
}