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    public partial class Service1 : ServiceBase
    {

        // This is a flag to indicate the service status
        private bool serviceStarted = false;

        // the thread that will do the work
        Thread workerThread;


        public Service1()
        {
            InitializeComponent();

            // Ereignissanzeige Log besorgen
            if (!System.Diagnostics.EventLog.SourceExists("MySource"))
            {
                System.Diagnostics.EventLog.CreateEventSource("MySource", "MyNewLog");
            }
            eventLog1.Source = "MySource";
            eventLog1.Log = "MyNewLog";
        }

        protected override void OnStart(string[] args)
        {
            eventLog1.WriteEntry("inOnStart");

            // Create worker thread, this worker thread will invoke the WorkerFunction when we start it
            // reason: when we use a separate worker thread, the main service
            // thread will return quickly, telling Windows that service has started
            ThreadStart st = new ThreadStart(WorkerFunction);
            workerThread = new Thread(st);

            // start the  worker thread
            workerThread.Start();

            // set flag to indicate worker thread is active
            serviceStarted = true;

        }

        protected override void OnStop()
        {
            eventLog1.WriteEntry("inOnStop");

            // flag to tell the worker thread to stop
            serviceStarted = false;

        }

        protected override void OnPause()
        {
            eventLog1.WriteEntry("inOnPause");
        }

        protected override void OnContinue()
        {
            eventLog1.WriteEntry("inOnContinue");
        }


        /// <summary>
        /// This function will do all the work
        /// Once it is done with its tasks, it will be suspended for some time;
        /// it will continue to repeat this until the service is stopped
        /// </summary>
        private void WorkerFunction()
        {
           // start an endless loop; loop will end only when "serviceStarted" flag = false
           while (serviceStarted)
           {
              // do something
              // exception handling omitted here for simplicity
              EventLog.WriteEntry("Service working", System.Diagnostics.EventLogEntryType.Information);
              eventLog1.WriteEntry("Service is working");
         
              // yield
              if (serviceStarted)
              {
                 Thread.Sleep(new TimeSpan(0, 2, 0));
              }
           }
         
           // time to end the thread
           Thread.CurrentThread.Abort();
        }
    }                    

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// start the  worker thread            
workerThread.Start();            
// set flag to indicate worker thread is active            
serviceStarted = true;