System Serviceprocess C# by API

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.ServiceProcess;
public class Service1 : System.ServiceProcess.ServiceBase
{
  public Service1()
  {
    this.ServiceName = "MyFirstService";
  }
  static void Main()
  {
    System.ServiceProcess.ServiceBase[] ServicesToRun;
    ServicesToRun = new System.ServiceProcess.ServiceBase[] { new Service1() };
    System.ServiceProcess.ServiceBase.Run(ServicesToRun);
  }
  protected override void OnStart(string[] args)
  {
    EventLog.WriteEntry( "Hello from MyFirstService" );
  }
  protected override void OnStop()
  {
    EventLog.WriteEntry( "Goodbye from MyFirstService" );
  }
}