window service in c#

I have below codes working fine in window service. Can you show me how to use timer?
My goal is to send email daily at 1:00 am (PST).


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ServiceProcess;
using System.Net.Mail;
using System.Threading;

namespace ConsoleApplication1
    class Program : ServiceBase
        static void Main(string[] args)
            ServiceBase.Run(new Program());
        public Program()
            this.ServiceName = "My Service";

       protected override void OnStart(string[] args)
            //TODO: place your start code here
            #region main code
            sendSingleEmail("email", "email", "test", "test", true);

        protected override void OnStop()
            //TODO: clean up any variables and stop any threads

        #region method:send email
        public static void sendSingleEmail(string from, string to, string subject, string body, bool isHtml)
            String smtpServer = "";
            System.Net.Mail.MailMessage MyMessage = new System.Net.Mail.MailMessage();
            MyMessage.Subject = subject;
            MyMessage.Body = body;
            MyMessage.From = new MailAddress(from);
            MyMessage.IsBodyHtml = isHtml;
            SmtpClient emailClient = new SmtpClient(smtpServer,25);
            emailClient.DeliveryMethod = SmtpDeliveryMethod.Network;
            emailClient.EnableSsl = false;
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Kyle AbrahamsSenior .Net DeveloperCommented:
You shouldn't use a service for this.  A service is something that runs constantly, looping at an interval to perform tasks.  There is no reason to keep your program in memory for that long if all your doing is sending an email once every day.

What I would recommend is a windows console application that when launched will send your email.  This is then scheduled via a scheduled task on a server/workstation.
Éric MoreauSenior .Net ConsultantCommented:
I have applications like this that need to run at interval. I always build plain-old Windows Forms and I schedule them in the Windows Tasks Scheduler. This way, it is easy for me to run anytime, to debug, ...

CHARU TCommented:
Its best written as a winforms program with Timer class and its tick() used to send the email with smtpclient. Registering as a service is needed when it actually is a product. It can be run as a background task as well thats starts at windows restart.
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Éric MoreauSenior .Net ConsultantCommented:
what I don't like about a Windows app with a Timer is if an error occurs, it is sometime not able to restart properly. If it is a scheduler that runs it, it always starts fresh. Also, a schedule task can run even if the computer is not logged on.
CHARU TCommented:
You can handle all the errors and what to do, if conditions. Also, whether the system is logged on or restarted, such things can also be tested by subscribing to windows events in C# code itself. You can log errors onto a text file, and proceed. Make sure there is no pop-up message boxes so its run in the background without user intervention.
ITsolutionWizardAuthor Commented:
Need codes sample
CHARU TCommented:
If you need code sample for Timer (?), then there are plenty in the web. Add a timer and do your email fn in the tick() event. You can also write a console app, and use a timer in it, log msgs and errors to a text file so there are no pop-ups.

What is your q exactly here?
Kyle AbrahamsSenior .Net DeveloperCommented:
I would agree with Eric on this . . . if there's an error the code might exit and not be called again.  With a scheduled task you're relying on the windows scheduler to call the executable.

For a console application:
sendSingleEmail  becomes the main of the program.  Then schedule the task on the computer and you're done.

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