想请教一个smtpmail发送的问题

简单的说一下，就是页面里有个textbox,有个提交按钮，
想点一下提交，然后textbox里的内容自动发送到";
        myMail.To = "[email protected]";
        myMail.Subject = "UtilMailMessage001";
        myMail.Priority = MailPriority.Low;
        myMail.BodyFormat = MailFormat.Text;
        myMail.Body = "Test";
        SmtpMail.SmtpServer = "smtp.mail.qq.com";
        SmtpMail.Send(myMail);
send的时候出问题