Send Email

 private string SendEmail(string mailTo, string body, ref int sendresult)
        {
            string errorEmailAddress = ""; 
            SmtpClient smtp = new SmtpClient(_SmtpServer);
            try
            {

                MailMessage message = new MailMessage();
                message.Priority = MailPriority.High;
                message.From = new MailAddress(_From);
                //message.To.Add(mailTo);
                message.Subject = _Subject;
                message.Body = body;
                message.IsBodyHtml = true;
                message.Bcc.Add(new MailAddress(_Bcc, "", Encoding.Default));
                SetToMailAddress(mailTo, message, ref errorEmailAddress);
                if (message.To.Count > 0)
                {
                    smtp.Send(message);
                    sendresult = 1;
                } 
                smtp.Dispose();
                return string.IsNullOrEmpty(errorEmailAddress) ? string.Empty : ("Error email address:"+errorEmailAddress);
            }
            catch (Exception e)
            {
                smtp.Dispose(); 
                return e.InnerException.Message + (string.IsNullOrEmpty(errorEmailAddress) ? "" : (" Error email address: " + errorEmailAddress)); 
            }
        }
        private static void SetToMailAddress(string toMailAddress, MailMessage message, ref string errorEmailAddress)
        {
            string[] addes = toMailAddress.Split(';').ToArray();
            foreach (string s in addes)
            {
                if (Regex.IsMatch(s, @"w+([-+.']w+)*@w+([-.]w+)*.w+([-.]w+)*"))
                {
                    message.To.Add(new MailAddress(s.Trim(), "", Encoding.Default));
                }
                else
                { errorEmailAddress += s + ";"; }
            }
        }