//Send Email
private void emailSend(string code)
{

　　//驗證發生的郵件地址不能為空；
　　if (String.IsNullOrWhiteSpace(this.txtUserMail.Text))
　　{
　　　　showErr("郵件地址");
　　　　return;
　　}
　　MailMessage mailMessage = new MailMessage();
　　mailMessage.To.Add(this.txtUserMail.Text);//收件人郵箱
　　mailMessage.From = new MailAddress("[email protected]

　　mailMessage.Subject = "this is a Test.";
　　mailMessage.SubjectEncoding = System.Text.Encoding.UTF8;

　　mailMessage.Body = "你申請的驗證碼是：" + code ;
　　mailMessage.BodyEncoding = System.Text.Encoding.UTF8;

　　mailMessage.IsBodyHtml = false;
　　mailMessage.Priority = MailPriority.High;

　　SmtpClient smtpClient = new SmtpClient();
　　smtpClient.Credentials = new System.Net.NetworkCredential("[email protected]", "ergerg");
　　smtpClient.Host = "smtp.exmail.qq.com";
　　object userState = mailMessage;
　　try
　　{
　　　　smtpClient.SendAsync(mailMessage, userState);
　　　　showErr("驗證碼已經發送到你的郵箱中，", "請注意查收！");
　　}
　　catch (SmtpException ex)
　　{
　　　　showErr("發生失敗！原因：", ex.ToString());
　　}
}