string smtpHost = "smtp.yandex.ru";
            int smtpPort = 25;
            string login = "";
            string pass = "";
 
            SmtpClient client = new SmtpClient(smtpHost, smtpPort);
            client.Credentials = new NetworkCredential(login, pass);
 
            string from = "";
            string to = "";
            string subject = "тема";
            string msgBody = String.Format("смс: {1}",
                        comboBox1.SelectedItem, textBox1.Text = lol11);
            MailMessage mess = new MailMessage(from, to, subject, msgBody);