public partial class ServiceUpdate: ServiceBase
    {
        private Thread StartWorkingAutoUpdate;
        public ServerUpdateURBD()
        {
            InitializeComponent();
            StartWorkingAutoUpdate = null;
        }

        protected override void OnStart(string[] args)
        {
            RemotingConfiguration.Configure("AutoUpdate.exe.config", false);
            StartWorkingAutoUpdate = new Thread(new ThreadStart(StartUpdate));
            StartWorkingAutoUpdate.Start();
        }

        protected override void OnStop()
        {
            if ((StartWorkingAutoUpdate != null) && (StartWorkingAutoUpdate.IsAlive))
            {
                StartWorkingAutoUpdate.Abort();
            }
        }

        protected void StartUpdate()
        {
            try
            {
                DoWorkUpdate classUpd = new DoWorkUpdate();
            }
            catch (ThreadAbortException)
            {
                Thread.ResetAbort();
                return;
            }
        }
    }
    public class classUpd
    {
        ....
    }

 public class UpdateDB : MarshalByRefObject
    {
        ....
    }

RemotingServices.Marshal(this, "ServerObject");

ServiceUpdate serv = new ServiceUpdate();
serv = (ServiceUpdate )Activator.GetObject(typeof(ServiceUpdate),
          String.Format("tcp://{0}:{1}/ServerObject",serverName, port));

ServiceUpdate serv;
serv = (ServiceUpdate )Activator.GetObject(typeof(ServiceUpdate),
          String.Format("tcp://{0}:{1}/ServerObject",serverName, port));
serv.[Некий метод]