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 + ";"; }            }        }