Issue in windows service

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.ServiceProcess;
using System.Data.OleDb;
using System.Net.Mail;
namespace AutomaticEmailSystem
{
    public partial class AutomaticEmailSystem : ServiceBase
    {
        private System.Data.OleDb.OleDbConnection conn;
        public AutomaticEmailSystem()
        {
            InitializeComponent();
            start();
        }
      static void Main()
        {
            System.ServiceProcess.ServiceBase[] ServicesToRun;
            // More than one user Service may run within the same process. To add
            // another service to this process, change the following line to
            // create a second service object. For example,
            //
            //   ServicesToRun = new System.ServiceProcess.ServiceBase[] {new Service1(), new MySecondUserService()};
            //
            ServicesToRun = new System.ServiceProcess.ServiceBase[] { new AutomaticEmailSystem() };
            System.ServiceProcess.ServiceBase.Run(ServicesToRun);
        }
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        ///
       private void start()
        {
            this.conn = new System.Data.OleDb.OleDbConnection();
            //
            // conn
            //
            this.conn.ConnectionString = @"Jet OLEDB:Global Partial Bulk Ops=2;Jet OLEDB:Registry Path=;Jet OLEDB:Database Locking Mode=1;Data Source=""C:\Email.mdb"";Mode=Share Deny None;Jet OLEDB:Engine Type=5;Provider=""Microsoft.Jet.OLEDB.4.0"";Jet OLEDB:System database=;Jet OLEDB:SFP=False;persist security info=False;Extended Properties=;Jet OLEDB:Compact Without Replica Repair=False;Jet OLEDB:Encrypt Database=False;Jet OLEDB:Create System Database=False;Jet OLEDB:Don't Copy Locale on Compact=False;User ID=Admin;Jet OLEDB:Global Bulk Transactions=1";
            //
            // GoodDay
            //
            this.CanHandlePowerEvent = true;
            this.CanPauseAndContinue = true;
            this.CanShutdown = true;
            this.ServiceName = "AutomaticEmailSystem";
        }
    /*    protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                if (components != null)
                {
                    components.Dispose();
                }
            }
            base.Dispose(disposing);
        }*/
        DataSet ds = new DataSet();
        protected override void OnStart(string[] args)
        {
             try
             {
                 // TODO: Add code here to start your service.
                 conn.Open();
                 OleDbDataAdapter da = new OleDbDataAdapter("select * from Email", conn);
                 da.Fill(ds);
                 string day = Convert.ToString(DateTime.Now.DayOfWeek);
                 if (day == "Wednesday")
                 {
                     foreach (DataRow dr in ds.Tables[0].Rows)
                     {
                         MailMessage mail = new MailMessage();
                         SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");
                         mail.From = new MailAddress("compueclinic@gmail.com");
                         string to = dr["mailid"].ToString();
                         mail.To.Add(to);
                         mail.Subject = "Stock And Sale Reports";
                         string mailtxt = "";
                         mail.IsBodyHtml = true;
                         mailtxt = "Hi " + to + ",";
                         mailtxt = mailtxt + "Good Day." + "</b></font><br><br>";
                         mailtxt = mailtxt + "<font face='verdana' color='#008080'><b>" + "May today be filled with sunshine and smile, laughter and love." + "</b></font><br><br>";
                         mailtxt = mailtxt + "<font face='verdana' color='#008080'><b>" + "Find the attached Stock and Sale Reports." + "</b></font><br><br>";
                         mailtxt = mailtxt + "<font face='verdana' color='#0000FF'><b>Cheers!" + "<br><br>";
                         mailtxt = mailtxt + "<font face='verdana' color='#0000FF'><b>Regards!" + "<br><br>";
                         mailtxt = mailtxt + "<font face='verdana' color='#0000FF'><b>Compueclinic@gmail.com" + "<br><br>";
                         //  mm.Body = mailtxt;
                         mail.Body = mailtxt;
                         System.Net.Mail.Attachment attachment,att;
                         attachment = new System.Net.Mail.Attachment("c:\\Stock_Report.xls");
                         att = new System.Net.Mail.Attachment("c:\\Sale_Report.xls");
                         mail.Attachments.Add(attachment);
                         mail.Attachments.Add(att);
                         SmtpServer.Port = 587;
                         SmtpServer.Credentials = new System.Net.NetworkCredential("*****@gmail.com", "******");
                         SmtpServer.EnableSsl = true;
                         SmtpServer.Send(mail);
                       eventLog1.WriteEntry("Automatic Email Service Started");
                     }
                 }
                 else
                 {
                     AutomaticEmailSystem aa = new AutomaticEmailSystem();
                     aa.Stop();
                     ///////Stop service manually  jst
                 }
             }
             catch (System.Exception ex)
             {
                 string excep = ex.ToString();
             }
        }

        protected override void OnStop()
        {
            // TODO: Add code here to perform any tear-down necessary to stop your service.
        }
    }
}