Search web via speech in c#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Speech.Recognition;
using System.Speech.Synthesis;
using System.IO;

namespace JARVIStest
{
    public partial class Form1 : Form
    {
        SpeechRecognitionEngine _recognizer = new SpeechRecognitionEngine();
        SpeechSynthesizer JARVIS = new SpeechSynthesizer();
        string QEvent;
        int count = 1;
        Random rnd = new Random();

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            _recognizer.SetInputToDefaultAudioDevice();
            _recognizer.LoadGrammar(new Grammar(new GrammarBuilder(new Choices(File.ReadAllLines(@"C:\Users\Cpyros\Desktop\lefteris\Commands.txt")))));
            _recognizer.SpeechRecognized += new EventHandler<speechrecognizedeventargs>(_recognizer_SpeechRecognized);
            _recognizer.RecognizeAsync(RecognizeMode.Multiple);
        }
        void _recognizer_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
        {
            int ranNum = rnd.Next(1, 10);
            string speech = e.Result.Text;
            switch (speech)
            {
                //GREETINGS
                case "hello":
                case "hello jarvis":
                    if (ranNum < 6) { JARVIS.Speak("Hello sir"); }
                    else if (ranNum > 5) { JARVIS.Speak("Hi"); }
                    break;
                case "goodbye":
                case "goodbye jarvis":
                case "close":
                case "close jarvis":
                    JARVIS.Speak("Until next time");
                    Close();
                    break;
                case "jarvis":
                    if (ranNum < 5) { QEvent = ""; JARVIS.Speak("Yes sir"); }
                    else if (ranNum > 4) { QEvent = ""; JARVIS.Speak("Yes?"); }
                    break;