CowService.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Diagnostics;

using Topshelf;

namespace CowService
{
    public class ProxyProcess
    {
        readonly Process proxy;

        public ProxyProcess()
        {
            proxy = new Process();
            proxy.StartInfo.FileName = "cow.exe";
            proxy.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
        }

        public void Start() { proxy.Start(); }
        public void Stop() { proxy.Kill(); }
    }
    class Program
    {
        static void Main(string[] args)
        {
            HostFactory.Run(x =>
            {
                x.Service<ProxyProcess>(s =>
                {
                    s.ConstructUsing(name => new ProxyProcess());
                    s.WhenStarted(tc => tc.Start());
                    s.WhenStopped(tc => tc.Stop());
                    
                });
                x.RunAsLocalSystem();
                x.StartAutomatically();

                x.SetDescription("Shadowsocks client cow.");
                x.SetDisplayName("cow");
                x.SetServiceName("cow");
            });
        }
    }
}