System.Speech SpeechRecognized event only runs once without restarting program

Hello all, I've created a sample speech recognition application in Visual Studio 2010, C# 4.0, which is to become part of a larger application.

The application reads back the words that are part of the loaded grammar successfully.

The problem is that my System.Speech SpeechRecognized event only runs once when I speak a recognized word in the Grammar.
If I attempt to call it again after it has run once, I get no response.
Only if I stop and restart my application will the event run.

I have enclosed the code I'm using.
Please suggest what I need to add or change to have the SpeechRecognizedEvent run when called, as I desire for additional recognized words to execute different portions of the voice program.

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

namespace SpeechRecogitionTest1
{
    public partial class Form1 : Form
    {
        public SpeechRecognitionEngine _recognizer = new SpeechRecognitionEngine();
        public SpeechSynthesizer _synth; 

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //Create grammar
            Choices words = new Choices();
            words.Add("Command");
            words.Add("Commands");
            Grammar wordsList = new Grammar(new GrammarBuilder(words));
            wordsList.SpeechRecognized += new EventHandler<SpeechRecognizedEventArgs>(wordsList_SpeechRecognized);
            _recognizer.LoadGrammarAsync(wordsList);
            _recognizer.SetInputToDefaultAudioDevice();
            _recognizer.RecognizeAsync();
        }

        public void  wordsList_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
        {
            if (e.Result.Text == "Command" || e.Result.Text == "Commands") //more e.Result.Text to be added
            {
                if (_synth == null)
                {
                    _synth = new SpeechSynthesizer();
                }
                PromptBuilder pb = new PromptBuilder();
                pb.StartParagraph();
                pb.StartSentence();
                pb.AppendText("This is sample text to speak");
                pb.EndSentence();
                pb.EndParagraph();
                pb.StartParagraph();
                pb.StartSentence();
                pb.AppendText("This is some more sample text to speak");	
                _synth.SpeakAsync(pb);
                pb.ClearContent();
            }
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            if (_recognizer != null)
            {
                _recognizer.Dispose();
            }
            if (_synth != null)
            {
                _synth.Dispose();
            }
            
        }
     
    }
}

One other thing. How can I get the SpeechRecognized event to recognize the word RESUME (as to begin again), instead of resume as in (Curriculum Vitae) or employment record. Thank you