asp.net mvc 发送邮箱验证码

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");
}