Windows服务只能部分工作

我第一次创建了Windows服务。它不起作用。创建了文件OnStart.txt和OnStop.txt，但没有发生其他任何事情。我不相信MSProcess会运行。如何进行故障排除？

namespace MailScan_Service
{
    public partial class svMaster : ServiceBase
    {
        private Timer myTimer = new Timer();
            public svMaster()
            {
                InitializeComponent();
            }
            ServiceController sc = new ServiceController("MailScan Service");
            protected override void OnStart(string[] args)           
            {
                 System.IO.File.Create(AppDomain.CurrentDomain.BaseDirectory + "OnStart.txt");
                 myTimer.Start();
            }
            protected override void OnStop()
            {
                if (myTimer.Enabled == true)
                    myTimer.Stop();
                System.IO.File.Create(AppDomain.CurrentDomain.BaseDirectory + "OnStop.txt");
            }
            private void myTimer_Elapsed(object sender, ElapsedEventArgs e)
            {
                if (!sc.Status.Equals(ServiceControllerStatus.StopPending))
                {
                    MSSettings msSet = new MSSettings();
                    msSet.Load();
                    myTimer.Interval = msSet.ScanTimer * 60000;
                    MSProcess.Start();
                    msSet.Dispose();
                }
            }     
}

然而，这个模拟器工作得很好！

namespace MailScanSettings
{
    public partial class FormSimService : Form
    {
        public FormSimService()
        {
            InitializeComponent();
        }
        private void btnGo_Click(object sender, EventArgs e)
        {
            tbStatus.Clear();
            tbStatus.Text += "Running";
            this.BackColor = Color.Green;
            timer1.Start();
        }
        private void btnStop_Click(object sender, EventArgs e)
        {
            if (timer1.Enabled == true)
                timer1.Stop();
            this.BackColor = Color.Red;
            tbStatus.Clear();
            tbStatus.Text += "Stopped";
        }
        private void timer1_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            MSSettings msSet = new MSSettings();
            msSet.Load();
            timer1.Interval = msSet.ScanTimer * 60000;            
            MSProcess.Start();
            msSet.Dispose();            
        }
    }
}