Windows service + WiX

public partial class Service1 : ServiceBase
    {
 
        private StreamWriter _file;
        private System.Timers.Timer timer1;
 
        public Service1()
        {
            InitializeComponent();
        }
 
 
        protected override void OnStart(string[] args)
        {
 
            _file =new StreamWriter(new FileStream("smslog.log", FileMode.Append));
            this._file.WriteLine("My service is started!!!");
            this._file.Flush();
            this.timer1 = new Timer();
            this.timer1.Enabled = true;
            this.timer1.Interval = 100000;
            this.timer1.Elapsed += new ElapsedEventHandler(this.timer1_Elapsed);
            this.timer1.AutoReset = true;
            this.timer1.Start();
 
        }
 
        protected override void OnStop()
        {
            this.timer1.Stop();
            this._file.WriteLine("Service is stopped");
            this._file.Flush();
            this._file.Close();
        }
        private void timer1_Elapsed(object sender, ElapsedEventArgs e)
        {
            this._file.WriteLine(DateTime.Now.ToString("dd.MM.yyyy HH:mm:ss"));
            this._file.Flush();
        }