อย่ากถามเรื่อง การเขียน Service แบบ multithread .Net 4.0 C#

protected override void OnStart(string[] args)
            try
            {
                m.WriteLog("start");
                ServiceTimer.Start();
                ServiceTimer.Elapsed += new ElapsedEventHandler(ServiceTimer_Timer);
                ServiceTimer.Interval = double.Parse("60000");
                ServiceTimer.Enabled = true;
            }
            catch (Exception ex)
            {
                m.WriteLog(ex.Message.ToString());
                ServiceTimer.Start();
                ServiceTimer.Enabled = true;
            }
        }

        private void ServiceTimer_Timer(object sender, ElapsedEventArgs e)
        {

            ServiceTimer.Enabled = false;

            string ReportID = "";
            List<DataList> list = new List<DataList>();
            DataTable DataDaily =null;
            DataTable DataMonthly = null;
            try
            {
                DataTable dt = m.GetDaily(e.SignalTime);
                if (dt != null)
                {
                    list = m.GetDataList(dt);
                    foreach (var i in list)
                    {

                    }
                }
                ServiceTimer.Enabled = true;
            }
            catch (Exception ex)
            {
                ServiceTimer.Enabled = true;
            }
        }