c#帮助类：发送邮件

         private static string IsOpenSendMail = ConfigurationManager.AppSettings["IsOpenSendMail"]; //是否启用异常消息发送邮箱功能
         private static string SendUser=ConfigurationManager.AppSettings["MailUserName"];
         private static string SendPass= ConfigurationManager.AppSettings["MailPassword"];
         private static string ReceiveMail = ConfigurationManager.AppSettings["ReceiveMail"];
         private static string MailHost = ConfigurationManager.AppSettings["MailHost"]; //smtp.gmail.com
         private static string MailPort = ConfigurationManager.AppSettings["MailPort"]; //Gmail的smtp端口587
         /// <summary>
         ///
         /// </summary>
         /// <param name="mailName">标题</param>
         /// <param name="body">内容</param>
         /// <param name="encoding">编码</param>
         /// <param name="isBodyHtml">是否Html</param>
         /// <param name="enableSsl">是否SSL加密连接</param>
         /// <returns>是否成功</returns>
         /// <returns></returns>
         public static void SendMail(string mailName, string body, string encoding = "UTF-8", bool isBodyHtml = true, bool enableSsl = true)
         {
             try
             {
                 if (!string.IsNullOrEmpty(IsOpenSendMail) && IsOpenSendMail=="开启")
                 {
                     MailMessage message = new MailMessage();
                     message.To.Add(new MailAddress(ReceiveMail)); // 接收人邮箱地址
                     message.From = new MailAddress(SendUser, mailName);
                     message.BodyEncoding = Encoding.GetEncoding(encoding);
                     message.Body = body;
                     //GB2312
                     message.SubjectEncoding = Encoding.GetEncoding(encoding);
                     message.Subject = mailName;
                     message.IsBodyHtml = isBodyHtml;

                     SmtpClient smtpclient = new SmtpClient(MailHost, Convert.ToInt32(MailPort)); //Gmail的smtp端口587
                     smtpclient.Credentials = new System.Net.NetworkCredential(SendUser, SendPass);
                     smtpclient.EnableSsl = enableSsl; //Gmail要求SSL连接
                     smtpclient.DeliveryMethod = SmtpDeliveryMethod.Network; //Gmail的发送方式是通过网络的方式，需要指定
                     smtpclient.Send(message);
                 }
             }
             catch (Exception ex)
             {
             }
         }