ZIP a Text file using C#, >net 3.5 , VS2008

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.ServiceProcess;
using System.Text;
using System.IO;
using System.Timers;
using ICSharpCode.SharpZipLib.Core;
using ICSharpCode.SharpZipLib.Zip;


namespace trail2zip
{
    public partial class trail2zip : ServiceBase
    {
        Timer timer;
        string path1 = @"E:\zipped files\New Text Document.txt";
        string path2 = @"E:\output\filezipname.zip";
        string path3 = @"E:\zipped files\R_23122015.txt";


        int timerInterval = 60000;

        public trail2zip()
        {
            InitializeComponent();
            timer = new Timer();
            timer.Elapsed+=new ElapsedEventHandler(this.timer_Elapsed);
            timer.Interval = timerInterval;
            timer.Enabled = true;

        }

        protected override void OnStart(string[] args)
        {
            timer.Start();
        }

        protected override void OnStop()
        {
            timer.Stop();
            timer.SynchronizingObject = null;
            timer.Elapsed -= new ElapsedEventHandler(this.timer_Elapsed);
            timer.Dispose();
            timer = null;


        }
        public void timer_Elapsed(object sender, ElapsedEventArgs e)
        {

            ZipFile z = ZipFile.Create(path2);       //(filezipname);
            z.BeginUpdate();
            z.Add(path1);
            z.Add(path3);
            z.CommitUpdate();
            z.Close();


        }
    }
}