C#

public class TimeLoggerService : ServiceBase
{
    public TimeLoggerService()
    {
        InitializeComponent();

        _timer = new Timer(10000);
        _timer.Elapsed += new ElapsedEventHandler(_timer_Elapsed);
    }

    protected override void OnStart(string[] args)
    {
        _timer.Start();
    }

    protected override void OnStop()
    {
        _timer.Stop();
    }

    protected void _timer_Elapsed(object sender, ElapsedEventArgs e)
    {
        // Do stuff here
    }
}