Speech recognition in c#

using System;
using System.Drawing;
using System.Text.RegularExpressions;
using System.Windows.Forms;

using System.Speech.Recognition;

namespace my
{
    public partial class Form1 : Form
    {
        SpeechRecognitionEngine recognitionEngine;

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            recognitionEngine = new SpeechRecognitionEngine();
            recognitionEngine.SetInputToDefaultAudioDevice();
            recognitionEngine.SpeechRecognized += (s, args) =>
            {
                string line1 = "";
                foreach (RecognizedWordUnit word in args.Result.Words)
                {
                    if (word.Confidence > 0.5f)
                        line1 += word.Text + " ";
                }

                string command1 = line1.Trim();
                System.Console.WriteLine(command1);
                if (command1 == "start")
                {
                    System.Console.WriteLine("!!!!TEST-1!!!!");

                    recognitionEngine = new SpeechRecognitionEngine();
                    recognitionEngine.SetInputToDefaultAudioDevice();
                    recognitionEngine.SpeechRecognized += (c, arg) =>
                    {
                        string line = "";
                        foreach (RecognizedWordUnit word in args.Result.Words)
                        {
                            if (word.Confidence > 0.5f)
                                line += word.Text + " ";
                        }

                        string command = line.Trim();
                        System.Console.WriteLine(command);
                        System.Console.WriteLine("!!!!TEST-2!!!!");
                        switch (command)
                        {
                            case "left":
                                MoveMouse(Cursor.Position.X - 50, Cursor.Position.Y);
                                break;
                            case "right":
                                MoveMouse(Cursor.Position.X + 50, Cursor.Position.Y);
                                break;
                            case "up":
                                MoveMouse(Cursor.Position.X, Cursor.Position.Y - 50);
                                break;
                            case "down":
                                MoveMouse(Cursor.Position.X, Cursor.Position.Y + 50);
                                break;
                        }

                        txtOutput.Text += line;
                        txtOutput.Text += Environment.NewLine;
                    };

                    recognitionEngine.UnloadAllGrammars();
                    recognitionEngine.LoadGrammar(CreateGrammars());
                    recognitionEngine.RecognizeAsync(RecognizeMode.Multiple);

                }
                else
                {
                    System.Console.WriteLine("!!!!TEST-3!!!!");
                }

               
                
                txtOutput.Text += line1;
                txtOutput.Text += Environment.NewLine;
            };

            recognitionEngine.UnloadAllGrammars();
            recognitionEngine.LoadGrammar(CreateGrammars());
            recognitionEngine.RecognizeAsync(RecognizeMode.Multiple);
        }
        

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            recognitionEngine.RecognizeAsyncStop();
        }

       
        private Grammar CreateGrammars()
        {
            Choices commandChoices = new Choices("left", "right", "up", "down","start");
            GrammarBuilder grammarBuilder = new GrammarBuilder();
            grammarBuilder.Append(commandChoices);
            return new Grammar(grammarBuilder);
        }

        private void MoveMouse(int x, int y)
        {
            this.Cursor = new Cursor(Cursor.Current.Handle);
            Cursor.Position = new Point(x, y);
            Cursor.Clip = new Rectangle(this.Location, this.Size);
        }

        private void richTextBox1_TextChanged(object sender, EventArgs e)
        {

        }
    }
}