MailMessage mailmsg = new MailMessage();
            SmtpClient smtpclient = new SmtpClient();
            mailmsg.To.Add(txtTo.Text);
            mailmsg.CC.Add(txtCC.Text);
            mailmsg.Subject = txtSubj.Text;
            mailmsg.From = new MailAddress("buvana@gmail.com");
            mailmsg.Body = txtbody.Text;

            smtpclient.Port = 587;
            smtpclient.Host = "smtp.gmail.com";
            smtpclient.EnableSsl = true;
            smtpclient.UseDefaultCredentials = false;
            smtpclient.Credentials = new NetworkCredential("buvana@gmail.com", "*********");
            smtpclient.Send(mailmsg);