asp.net mvc 发送验证码

  public ActionResult Index()
        {
            /*第一种，利用Google的smtp来发送邮件*/
            SmtpClient client = new SmtpClient("smtp.163.com", 25);
            Random Rdm = new Random();
            //产生0到100的随机数
            int iRdm = Rdm.Next(99999, 100000);
            MailMessage msg = new MailMessage("邮箱@163.com", "接收的邮箱", "验证码", iRdm.ToString());
            client.UseDefaultCredentials = false;
            System.Net.NetworkCredential basicAuthenticationInfo =
                new System.Net.NetworkCredential("163邮箱注册的账号", "163邮箱注册的密码");
            client.Credentials = basicAuthenticationInfo;
            client.EnableSsl = true;
            client.Send(msg);
            return Content("s");
        }