C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Linq;
using System.ServiceProcess;
using System.Text;
using System.Timers;
using System.IO;
using System.Xml;

namespace OTMService
{
    public partial class OTMService : ServiceBase
    {
        private Timer timer1 = null;
        string tt1, tt2, tt3, tt4, tt5, tt6, thetime, time, tmp1, tmp0ch, basetmp, tmpAMPM;
        int spp = 0, stime = 0;
        public OTMService()
        {
            InitializeComponent();
        }

        protected override void OnStart(string[] args)
        {
            timer1 = new Timer();
            this.timer1.Interval = 60000; //for every 30 secs=30000 and for 1 minute 60000 and 300000
            this.timer1.Elapsed += new System.Timers.ElapsedEventHandler(this.timer1_Tick);
            timer1.Enabled = true;
            Library.WriteErrorLog("Test window service started--Just Khan");
        }

        private void timer1_Tick(object sender, ElapsedEventArgs e)
        {
            mymainProg();
        }
        protected override void OnStop()
        {
            timer1.Enabled = false;
            Library.WriteErrorLog("Test window service stopped--Just Khan-Service got stopped");
        }
        public void mymainProg()
        {
            string dirpath = AppDomain.CurrentDomain.BaseDirectory;
            //xml reading for getting time mentioned in xml file.
            try
            {
                XmlDocument xmlDoc1 = new XmlDocument();
                xmlDoc1.Load(dirpath+"OTMAppSetting.xml");
                thetime = xmlDoc1.SelectSingleNode("Data/ServTime").InnerText;
                //thetime = "02:04 PM";
                tmp1 = thetime.Substring(3, 2);
                tmp0ch = thetime.Substring(3, 1);
                basetmp = thetime.Substring(0, 3);
                tmpAMPM = thetime.Substring(6, 2);
                spp = Convert.ToInt32(tmp1);
                stime = checktime(spp);
                if(tmp0ch=="0")
                {
                    tt1 = basetmp + "0"+ stime.ToString() + " " + tmpAMPM;
                    stime = stime + 1;
                    tt2 = basetmp + "0" + stime.ToString() + " " + tmpAMPM;
                    stime = stime + 1;
                    tt3 = basetmp + "0" + stime.ToString() + " " + tmpAMPM;
                    stime = stime + 1;
                    tt4 = basetmp + "0" + stime.ToString() + " " + tmpAMPM;
                    stime = stime + 1;
                    tt5 = basetmp + "0" + stime.ToString() + " " + tmpAMPM;
                    stime = stime + 1;
                    tt6 = basetmp + "0" + stime.ToString() + " " + tmpAMPM;
                }
                else
                {
                    tt1 = basetmp + stime.ToString() + " " + tmpAMPM;
                    stime = stime + 1;
                    tt2 = basetmp + stime.ToString() + " " + tmpAMPM;
                    stime = stime + 1;
                    tt3 = basetmp + stime.ToString() + " " + tmpAMPM;
                    stime = stime + 1;
                    tt4 = basetmp + stime.ToString() + " " + tmpAMPM;
                    stime = stime + 1;
                    tt5 = basetmp + stime.ToString() + " " + tmpAMPM;
                    stime = stime + 1;
                    tt6 = basetmp + stime.ToString() + " " + tmpAMPM;
                }
                
            }
            catch (Exception g)
            {
                Library.WriteErrorLog("Xml loading error for time: Error" + g.ToString());
            }
            //Write code here to do some job depends on your requirement
            DateTime dt = DateTime.Now;
            time = dt.ToString("hh:mm tt");
            /*if (time == "02:49 PM" || time == "02:52 PM" || 
                time == "02:56 PM" || time == "02:57 PM" || 
                time == "02:58 PM" || time == "02:59 PM")*/
            if (time == tt1 || time == tt2 ||
                time == tt3 || time == tt4 ||
                time == tt5 || time == tt6)
            {
                //Library.WriteErrorLog("Timer ticked now inside time... and some job has been done successfully--JustKhan-Job Initiated :");
                try
                {
                    Library.WriteErrorLog("Inside time and under try and catch Before Using");
                    //killing already existing process....
                    foreach (var process in Process.GetProcessesByName("OTMBackendServiceExe"))
                    {
                        process.Kill();
                    }
                    //-------------killing completed...
                    using (Process pp = Process.Start(dirpath + "OTM_Plan_BackExe\\OTMBackendServiceExe.exe"))
                    {
                        int id = pp.Id;
                        //Library.WriteErrorLog("Process iD: "+id.ToString());
                        //Library.WriteErrorLog("Process Name: " + pp.ProcessName.ToString());
                        Process tempProc = Process.GetProcessById(id);
                        //tempProc.WaitForExit(60000);
                        //tempProc.WaitForExit();
                        Library.WriteErrorLog("Process completed all");
                    }
                }
                catch (Exception ex)
                {
                    Library.WriteErrorLog("Main Exe cannot be started: " + ex.ToString());
                }

            }
        }

        private int checktime(int ss)
        {
            int theret = 0;
            switch (ss)
            {
                case 54:
                    theret = ss - 2;
                    break;
                case 55:
                    theret = ss - 3;
                    break;
                case 56:
                    theret = ss - 4;
                    break;
                case 57:
                    theret = ss - 5;
                    break;
                case 58:
                    theret = ss - 6;
                    break;
                case 59:
                    theret = ss - 6;
                    break;
                default:
                    theret = ss;
                    break;
            }
            return theret;
        }
    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Configuration;
using System.Xml.Linq;
using System.Xml;
using System.IO;
using Oracle.DataAccess.Client;
using Excel = Microsoft.Office.Interop.Excel;
using System.Net.Mail;

namespace OTMBackendServiceExe
{
    public partial class Form1 : Form
    {
        string oraCstr, qrystr, qrystr1, OraCon, malstatus;
        bool chk1 = false, chk2 = false;
        int lcount = 0, chkkedd=0;
        string empname, email_id, sup_email, cc_maillst, fcc_maillst, skilltype, product, skilltrack, current_level, target_level, tomail_sub;
        string mailfor, otmmailbody, mail_sent_date, mail_sent_status, mailerr_msg;
        string repformpath, repoutputpath, repfilename;
        StringBuilder mlmsg = new StringBuilder();

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            WriteToFile("Testing: App Started");
            XmlDocument xmlDoc = new XmlDocument();
            //xmlDoc.Load("d:\\product.xml");
            xmlDoc.Load("OTMAppSetting.xml");
            //string id = xmlDoc.SelectSingleNode("Data/Short_Fall").InnerText;
            oraCstr = "";
            oraCstr = xmlDoc.SelectSingleNode("Data/DBstr").InnerText;
            frommail = xmlDoc.SelectSingleNode("Data/frommmail").InnerText;
            cc_maillst = xmlDoc.SelectSingleNode("Data/ccmaillst").InnerText;
            WriteToFile("Started @:"+DateTime.Now.ToString());
            //--------------------------------------
            //-----these are for checking purpose------------
            //dbcheck();
            //string dd = mailcheck();
            //WriteToFile("MailStatus :" + dd);
            //To Enable from here...
            //--------------------------------------
            nightqry();
            allresettings();
            skillupgrademail();
            //--------------------------------------
            //all functions End here.....
            WriteToFile("Ended @:" + DateTime.Now.ToString());
            Application.Exit();
            //this.Close();
        }