gistfile1.cs

        public void SendMail()
        {
            SmtpClient client = new SmtpClient(ConfigurationManager.AppSettings["SMTPAddress"].ToString());
            client.Credentials = new NetworkCredential(ConfigurationManager.AppSettings["User"].ToString(),
                ConfigurationManager.AppSettings["Password"].ToString(),
                ConfigurationManager.AppSettings["Domain"].ToString());

            Recipients.Insert(0, (ConfigurationManager.AppSettings["IntimationEmailId"].ToString()));

            int pageSize = int.Parse(ConfigurationManager.AppSettings["BatchSize"].ToString());
            int counter = 0;

            var recipients = Recipients.Skip(counter * pageSize).Take(pageSize);

            do
            {
                using (MailMessage message = new MailMessage())
                {
                   message.From = new MailAddress(ConfigurationManager.AppSettings["SenderEmailId"].ToString());
                   foreach (string address in recipients)
                    {
                        try
                        {
                              message.Bcc.Add(address);
                        }
                        catch ()
                        {
                        }
                    }

                    Body += Environment.NewLine;
                    message.Body = Body;
                    message.IsBodyHtml = true;
                    message.Subject = Subject;
                    message.SubjectEncoding = System.Text.Encoding.UTF8;

                    try
                    {
                        client.Send(message);
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine(ex.Message);
                    }
                }

                counter += 1;
                recipients = Recipients.Skip(counter * pageSize).Take(pageSize);
            }
            while (recipients.Count() > 0);

            }
    }