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.Net.Mail;

namespace MyTestWindowsService
{
    public partial class MyTestWindowsService : ServiceBase
    {
        public MyTestWindowsService()
        {
            InitializeComponent();

            if (!System.Diagnostics.EventLog.SourceExists("MyTestWindowsService"))
            {
                System.Diagnostics.EventLog.CreateEventSource("MySource", "MyNewLog");
            }

            eventLog1.Source = "MyEventLogSource";
            eventLog1.Log = "MyNewLog Comes here!";
        }

        protected override void OnStart(string[] args)
        {
            eventLog1.WriteEntry("In OnStart");
        }

        protected override void OnStop()
        {
            eventLog1.WriteEntry("In onStop.");
        }

        protected override void OnContinue()
        {
            eventLog1.WriteEntry("In OnContinue.");
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            if (DateTime.Now.Minute == 30)
            {
                eventLog1.WriteEntry("starting to send email.");

                try
                {
                    MailMessage mail = new MailMessage();
                    SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");

                    mail.From = new MailAddress("it@mydomain.com");
                    mail.To.Add("jassim@mydomain.com");
                    mail.Subject = "Test Mail";
                    mail.Body = "This is for testing SMTP mail from GMAIL";

                    SmtpServer.Port = 587;
                    SmtpServer.Credentials = new System.Net.NetworkCredential("it@mydomain.com", "mypassword");
                    SmtpServer.EnableSsl = true;

                    SmtpServer.Send(mail);

                    eventLog1.WriteEntry("email sent.");
                }
                catch (Exception ex)
                {
                    // MessageBox.Show(ex.ToString());
                    eventLog1.WriteEntry("failed sending email.");
                }
            }
        }
    }
}