How my web application send automatically email daily,weekly and monthly to specific email ids ?

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C#

email

SMTP

ASP.NET4

Hello Everyone,
I here i have web application in which i want send email to several ids simultaneously on the basis of time, i.e send daily mail to some user ,weekly to some user and monthly send to some user.

I know only concept of sending mail....like

 try
            {
               
                MailMessage mailMessage = new MailMessage();
                mailMessage.To.Add("sujata.shinde@jkumar.com");
                mailMessage.From = new MailAddress("shinde.sshinde.sujata@gmail.com");
                mailMessage.Subject = "ASP.NET e-mail test";
                mailMessage.Body = "Hello world,\n\nThis is an ASP.NET test e-mail!";
                mailMessage.Attachments.Add(new Attachment("C:\\Users\\Satheesh\\Desktop\\Automail.txt"));
                
                
                SmtpClient smtpClient = new SmtpClient("smtp.gmail.com");
                smtpClient.Port = 587;
                smtpClient.EnableSsl = true;

                NetworkCredential NetworkCred = new NetworkCredential("shinde.sshinde.sujata@gmail.com","*******");
                smtpClient.UseDefaultCredentials = true;
                smtpClient.Credentials = NetworkCred;
                smtpClient.Send(mailMessage);
  //              Console.WriteLine("E-Mail Sent");
                ClientScript.RegisterStartupScript(GetType(), "alert", "alert('Email sent.');", true);
                //DateTime current_time = DateTime.Now;
                //current_time = current_time.AddSeconds(10);
                //Thread.Sleep(10000);
                 Response.Write("E-mail sent!");
            }
            catch (Exception ex)
            {
                Response.Write("Could not send the e-mail - error: " + ex.Message);

            }


Please share your ideas to send mail  daily ,weekly and montly .


thanks,
Sujata