Speech Recognition using Interop.SpeechLib.dll with 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.Drawing.Drawing2D;
using System.Runtime.InteropServices;
using System.Threading;
using SpeechLib;
using MediaPlayer;
using WMPLib;
using System.Diagnostics;



 private SpeechLib.SpSharedRecoContext objRecoContext;
        private SpeechLib.ISpeechRecoGrammar grammar = null;
        private SpeechLib.ISpeechGrammarRule menuRule = null;
        SpVoice spo = new SpVoice();
        bool saved = false;
        bool enable_speach = false;
        bool speach_diabletime_out = false;



     private void Form1_Load(object sender, EventArgs e)
        {
         
            try
            {
                objRecoContext = new SpSharedRecoContext();
           
                spo.Speak("Welcome", SpeechVoiceSpeakFlags.SVSFlagsAsync);
                spo.WaitUntilDone(1000);
           
                enable_speach = false;
                objRecoContext.Recognition += new _ISpeechRecoContextEvents_RecognitionEventHandler(Reco_Event);
           
            }
            catch (Exception exp)
            {

                MessageBox.Show("Install speech Before Statring Akku", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error, MessageBoxDefaultButton.Button1);
                Application.Exit();
            }

       
           
   
        }




 string result = "";

        private void Reco_Event(int StreamNumber, object StreamPosition, SpeechRecognitionType RecognitionType, ISpeechRecoResult Result)
        {


            result = Result.PhraseInfo.GetText(0, -1, true);
       
            if (result == Properties.Settings.Default.start)
            {
             
                System.Diagnostics.Process p = new System.Diagnostics.Process();
                //p.StartInfo.FileName = @"C:\Program Files\Mozilla Firefox\firefox.exe";
                p.StartInfo.FileName = @"C:\Program Files\Internet Explorer\IEXPLORE.EXE";
                p.Start();
                p.StartInfo.FileName = @"C:\\Windows";
                p.Start();
                //System.Diagnostics.Process("C:\\Windows");

            }
            if (result == Properties.Settings.Default.explorer)
            {
             
                System.Diagnostics.Process p = new System.Diagnostics.Process();
                p.StartInfo.FileName = @"C:\Program Files\Internet Explorer\IEXPLORE.EXE";
                p.Start();

             
            }
            if (result == Properties.Settings.Default.player)
            {
                result = "";
                System.Diagnostics.Process p = new System.Diagnostics.Process();
                p.StartInfo.FileName = @"C:\Program Files\Windows Media Player\wmplayer.exe" ;
                p.Start();
                System.Diagnostics.Process.Start(@"D:\virtulamouse\virtulamouse\01 - Kya Mujhe Pyaar Hai (Kay Kay).mp3");

            }
            if (result == Properties.Settings.Default.notepad)
            {
                result = "";
                System.Diagnostics.Process p = new System.Diagnostics.Process();
                p.StartInfo.FileName = @"notepad.exe";
                p.Start();
                //System.Diagnostics.Process.Start(@"%SystemRoot%\system32\notepad.exe");

            }
            if (result == Properties.Settings.Default.keyboard)
            {
                result = "";
                System.Diagnostics.Process p = new System.Diagnostics.Process();
                p.StartInfo.FileName = @"osk.exe";
                p.Start();
                //System.Diagnostics.Process.Start(@"%SystemRoot%\system32\notepad.exe");

            }
            serialPort1.Close();

            //System.Windows.Forms.SendKeys.SendWait("This text was entered ");
            //Thread.Sleep(1000);
            //System.Windows.Forms.SendKeys.SendWait("{TAB}");
            //Thread.Sleep(1000);
            //System.Windows.Forms.SendKeys.SendWait("using the System.Windows.");
            //Thread.Sleep(1000);

        }

        private void btnenablespeech_Click(object sender, EventArgs e)
        {
            try
            {
                grammar = objRecoContext.CreateGrammar(0);
                menuRule = grammar.Rules.Add("MenuCommands", SpeechRuleAttributes.SRATopLevel | SpeechRuleAttributes.SRADynamic, 1);
                object PropValue = "";

            menuRule.InitialState.AddWordTransition(null, Properties.Settings.Default.start, " ", SpeechGrammarWordType.SGLexical, Properties.Settings.Default.start, 2, ref PropValue, 1.0F);
            menuRule.InitialState.AddWordTransition(null, Properties.Settings.Default.explorer, " ", SpeechGrammarWordType.SGLexical, Properties.Settings.Default.explorer, 3, ref PropValue, 1.0F);
            menuRule.InitialState.AddWordTransition(null, Properties.Settings.Default.player, " ", SpeechGrammarWordType.SGLexical, Properties.Settings.Default.player, 4, ref PropValue, 1.0F);
            menuRule.InitialState.AddWordTransition(null, Properties.Settings.Default.notepad, " ", SpeechGrammarWordType.SGLexical, Properties.Settings.Default.notepad, 5, ref PropValue, 1.0F);
            menuRule.InitialState.AddWordTransition(null, Properties.Settings.Default.keyboard, " ", SpeechGrammarWordType.SGLexical, Properties.Settings.Default.keyboard, 5, ref PropValue, 1.0F);
         
            //menuRule.InitialState.AddWordTransition(null, Properties.Settings.Default.start, " ", SpeechGrammarWordType.SGLexical, Properties.Settings.Default.start, 2, ref PropValue, 1.0F);
            //menuRule.InitialState.AddWordTransition(null, Properties.Settings.Default.explorer, " ", SpeechGrammarWordType.SGLexical, Properties.Settings.Default.explorer, 3, ref PropValue, 1.0F);
            //menuRule.InitialState.AddWordTransition(null, Properties.Settings.Default.player, " ", SpeechGrammarWordType.SGLexical, Properties.Settings.Default.player, 4, ref PropValue, 1.0F);
            //menuRule.InitialState.AddWordTransition(null, Properties.Settings.Default.notepad, " ", SpeechGrammarWordType.SGLexical, Properties.Settings.Default.notepad, 5, ref PropValue, 1.0F);
            //menuRule.InitialState.AddWordTransition(null, Properties.Settings.Default.keyboard, " ", SpeechGrammarWordType.SGLexical, Properties.Settings.Default.keyboard, 5, ref PropValue, 1.0F);
                grammar.Rules.Commit();
                grammar.CmdSetRuleState("MenuCommands", SpeechRuleState.SGDSActive);
            }
            catch (Exception exp)
            {

                MessageBox.Show(exp.Message);
                if (serialPort1.IsOpen == true)
                {
                    serialPort1.Close();
                }
                return;
            }

            spo.Speak("start", SpeechVoiceSpeakFlags.SVSFlagsAsync);
            spo.WaitUntilDone(1000);
            if (button2.Text == "Enable Speech")
            {
                button2.Text = "Disable Speech";
            }
            else if (button2.Text == "Disable Speech")
            {
                objRecoContext.EndStream += new _ISpeechRecoContextEvents_EndStreamEventHandler(wavRecoContext_EndStream);
                button2.Text = "Enable Speech";
            }
        }

  private void wavRecoContext_EndStream(int StreamNumber, object StreamPosition, bool f)
        {

            // ' Disable dictation

            grammar.DictationSetState(SpeechRuleState.SGDSInactive);

        }