Face detection (Emgu cv) and Microsoft speech recognition.

Question

Hello.
I have problem with Emgu cv and Microsoft Speech.
Speech recognition works fine until I turn on face detection (button1_Click).
Where is problem? What I'm doing wrong?

I'm thinking the problem may be in:

sre.SpeechRecognized += new EventHandler<SpeechRecognizedEventArgs>(sre_SpeechRecognized);

and

Application.Idle += new EventHandler(FrameGrabber);

but I don't know how solve this.

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
using Emgu.CV;
using Emgu.CV.Structure;
using Emgu.CV.CvEnum;
using System.IO;
using System.Diagnostics;
using Microsoft.Speech.Recognition;
using Microsoft.Speech.Synthesis;

namespace MultiFaceRec
{
    public partial class FrmPrincipal : Form
    {
        //Declararation of all variables, vectors and haarcascades
        Image<Bgr, Byte> currentFrame;
        Capture grabber;
        HaarCascade face;
        HaarCascade eye;
        MCvFont font = new MCvFont(FONT.CV_FONT_HERSHEY_TRIPLEX, 0.5d, 0.5d);
        Image<Gray, byte> result, TrainedFace = null;
        Image<Gray, byte> gray = null;
        List<Image<Gray, byte>> trainingImages = new List<Image<Gray, byte>>();
        List<string> labels= new List<string>();
        List<string> NamePersons = new List<string>();
        int ContTrain, NumLabels, t;
        string name, names = null;


        SpeechSynthesizer synth = new SpeechSynthesizer();

        public FrmPrincipal()
        {
            InitializeComponent();
            //Load haarcascades for face detection
            face = new HaarCascade("haarcascade_frontalface_default.xml");

            synth.SelectVoice("Microsoft Server Speech Text to Speech Voice (pl-PL, Paulina)");
            synth.SetOutputToDefaultAudioDevice();

            System.Globalization.CultureInfo ci = new System.Globalization.CultureInfo("pl-PL");
            SpeechRecognitionEngine sre = new SpeechRecognitionEngine(ci);
            sre.SetInputToDefaultAudioDevice();
            sre.SpeechRecognized += new EventHandler<SpeechRecognizedEventArgs>(sre_SpeechRecognized);
            Choices numbers = new Choices();
            numbers.Add(new string[] { "Pierwszy test aplikacji.", "dwa", "szczyt", "jeden"});

            GrammarBuilder gb = new GrammarBuilder();
            gb.Append(numbers);
            Grammar g = new Grammar(gb);
            sre.LoadGrammar(g);

            sre.RecognizeAsync(RecognizeMode.Multiple);

            try
            {
                //Load of previus trainned faces and labels for each image
                string Labelsinfo = File.ReadAllText(Application.StartupPath + "/TrainedFaces/TrainedLabels.txt");
                string[] Labels = Labelsinfo.Split('%');
                NumLabels = Convert.ToInt16(Labels[0]);
                ContTrain = NumLabels;
                string LoadFaces;

                for (int tf = 1; tf < NumLabels+1; tf++)
                {
                    LoadFaces = "face" + tf + ".bmp";
                    trainingImages.Add(new Image<Gray, byte>(Application.StartupPath + "/TrainedFaces/" + LoadFaces));
                    labels.Add(Labels[tf]);
                }

            }
            catch(Exception e)
            {
                //MessageBox.Show(e.ToString());
                MessageBox.Show("Nothing in binary database, please add at least a face(Simply train the prototype with the Add Face Button).", "Triained faces load", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
            }

        }

        private void sre_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
        {
            if (e.Result.Confidence > 0.82)

            {
                label6.Text = e.Result.Text;
                synth.Speak("Powiedziales: ");
                synth.SpeakAsync(label6.Text);
                //label6.Text = "";
            }
            //throw new NotImplementedException();
            return;
        }


        private void button1_Click(object sender, EventArgs e)
        {
            //Initialize the capture device
            grabber = new Capture();
            grabber.QueryFrame();
            //Initialize the FrameGraber event
            Application.Idle += new EventHandler(FrameGrabber);
            button1.Enabled = false;
        }