How to create Windows Services in C#? Example.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.ServiceProcess;
using System.Text;
using System.Threading.Tasks;
using System.Timers;

namespace ScheduledService
{
    public partial class ScheduledService : ServiceBase
    {
        Timer timer = new Timer();
        public ScheduledService()
        {
            InitializeComponent();
        }
        protected override void OnStart(string[] args)
        {
            TraceService("start service");
            timer.Elapsed += new ElapsedEventHandler(OnElapsedTime);
            timer.Interval = 1000;
            timer.Enabled = true;
        }
        protected override void OnStop()
        {
            timer.Enabled = false;
            TraceService("stopping service");
        }
        private void OnElapsedTime(object source, ElapsedEventArgs e)
        {
            TraceService("Another entry at " + DateTime.Now);
        }
        private void TraceService(string content)
        {
            FileStream fs = new FileStream(@"d:\ScheduledService.txt", FileMode.OpenOrCreate, FileAccess.Write);
            StreamWriter sw = new StreamWriter(fs);
            sw.BaseStream.Seek(0, SeekOrigin.End);
            sw.WriteLine(content);
            sw.Flush();
            sw.Close();
        }
    }
}

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