static void Main(string[] args)
    {
        ServiceBase[] ServicesToRun = new ServiceBase[]
        {
            new Service1()
        };

        ServiceBase.Run(ServicesToRun);
    }

static void Main(string[] args)
    {
        ServiceBase[] ServicesToRun = new ServiceBase[]
        {
            new Service1(),
            new Service2()
        };

        ServiceBase.Run(ServicesToRun);
    }