Questions regarding reading files

Question

I have my service code already ready, but inside it, I should get the first file containing the extension .cpv, in case I read this file, inside the file it contains several vouchers with its due information, however, I need to save the data it contains on each voucher, such as date and time, document value, as soon as I finish processing this file, I have to move those files to another folder. How could I be initiating this coding of this application? Because in my windows service project, I already have two classes LogService and Program.cs, already ready, as it is a windows service, how could I apply these requirements in this windows functionality, to read those files in that directory? Would you kindly help me, friend?

 

Here's my service code:

 

Service1.cs

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 ServicoProcessamentoComprovantes
{
    public partial class Service1: ServiceBase
    {
        private Timer timer1 = null;
        public Service1 ()
        {
            InitializeComponent ();
        }

        protected override void OnStart (string [] args)
        {
            LogService.writeEventLog ("The timer is set to 10 seconds");
            timer1 = new Timer ();
            // 1000 = one seconds
            this.timer1.Interval = 1000; // 10 seconds
            this.timer1.Elapsed + = new ElapsedEventHandler (this.timer_tick);
            this.timer1.Enabled = true;
            LogService.writeEventLog ("Starting Banestes service");
        }

        private void timer_tick (object sender, ElapsedEventArgs e)
        {
            // ALL:
            LogService.writeEventLog ("The timer and some operations are running ...");
            // ALL:

            LogService.writeEventLog ("Operation completed successfully");
        }
        protected override void OnStop ()
        {
            LogService.writeEventLog ("******** --Event: Idle-- ********");
            LogService.writeEventLog ("Attempt to Stop Service");
            timer1.Stop ();
            timer1 = null;
            LogService.writeEventLog ("Service stopped by user");
        }
        private void ListArchives ()
        {
            string extension = Path.GetExtension ("");
            DirectoryInfo Dir = new DirectoryInfo (@ "\\ S3A601 \ ftp @ sefaz \ BANESTES \ Output_SDPJ \ test");
        }
    }
}