C#

[RunInstaller(true)]
public partial class MessagingInstaller : Installer
{
    public MessagingInstaller()
    {
        InitializeComponent();
    }
}

public partial class MessagingService : ServiceBase
{
    //declare the message sending logic
    private MessagingLogic msglgc;
    //private readonly EventLog _log = new EventLog { Source = "MessageLogger" };

    public MessagingService()
    {
        InitializeComponent();
    }

    //create new instance of the message sending logic and/or start service
    protected override void OnStart(string[] args)
    {
        if (!EventLog.SourceExists("MessageLogger"))
            EventLog.CreateEventSource("MessageLogger", "Event Logger");

        var _log = new EventLog { Source = "MessageLogger" };

        try
        {
            if (msglgc == null)
                msglgc = new MessagingLogic();

            msglgc.Start();
        }
        catch (ArgumentException exception)
        { _log.WriteEntry("OnStart Error: " + exception.Message); }
    }

    //stop the service
    protected override void OnStop()
    {
        if (!EventLog.SourceExists("MessageLogger"))
            EventLog.CreateEventSource("MessageLogger", "Event Logger");

        var _log = new EventLog { Source = "MessageLogger" };

        try
        {
            if (msglgc != null)
                msglgc.Stop();
        }
        catch (ThreadAbortException exception)
        { _log.WriteEntry("OnStop Error: " + exception.Message); }
    }
}