zipping a text file in windows services

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C#3.0

C#

ASP.NET

Windows-service

the below code is successfully zipping a text file from a predefined folder location. Now i want to modify this code in such a way that 'any file in the folder if found (giving the name of text file in run time)the data should be uploaded & it should be zipped, & the old file should be deleted. I can do this if i dont have runtime text file names, but doing the same in run time.. hope someone will help me with this.

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();
 

        }
    }
}