发送电子邮件

 protected void Button1_Click(object sender, EventArgs e)
    {
        string from = txtform.Text;
        string to = Txtto.Text;
        string subject = Txtsubject.Text;
        string body = txtbody.Text;
        //Utilities.SendMail(from,to,subject,body);
        Sendmail(from,to,subject,body);
    }
    private void Sendmail(string from, string to, string subject, string body)
    {
        SmtpClient smtp = new SmtpClient("smtp.126.com");
        smtp.Credentials = new NetworkCredential("cbt5238","xxxxxxx");
        MailMessage message = new MailMessage(from,to,subject,body);
        message.From = new MailAddress("cbt5238@126.com");
        smtp.Send(message);
    }