/// <summary>發送email,默認是25端口
        /// 
        /// </summary>
        /// <param name="title">郵件標題</param>
        /// <param name="body">郵件內容</param>
        /// <param name="toAdress">收件人</param>
        /// <param name="fromAdress">發件人</param>
        /// <param name="userName">發件用戶名</param>
        /// <param name="userPwd">發件密碼</param>
        /// <param name="smtpHost">smtp地址</param>
        public static void SendMail(string title, string body, string toAdress, string fromAdress,
                              string userName, string userPwd, string smtpHost)
        {
            try
            {
                MailAddress to = new MailAddress(toAdress);
                MailAddress from = new MailAddress(fromAdress);
                System.Net.Mail.MailMessage message = new System.Net.Mail.MailMessage(from, to);
                message.IsBodyHtml = true; // 如果不加上這句那發送的郵件內容中有HTML會原樣輸出 
                message.Subject = title; message.Body = body;
                SmtpClient smtp = new SmtpClient();
                smtp.UseDefaultCredentials = true;
                smtp.Port = 25;
                smtp.Credentials = new NetworkCredential(userName, userPwd);
                smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
                smtp.Host = smtpHost;
                message.To.Add(toAdress);
                smtp.Send(message);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }