C#发送邮件

//TODO:发送邮件
  private void Btn_Send_Click(object sender, System.EventArgs e)
  {
  msgTo.From = "amthlon@tom.com";
   msgTo.BodyFormat = MailFormat.Text ;
   msgTo.Body = mailtxt;
   msgTo.Subject = title;
   msgTo.Priority = MailPriority.Normal;
   msgTo.To = "amthlon@tom.com;amthlon@sohu.com";
   msgTo.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1");
   msgTo.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", "amthlon");
   msgTo.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", "pwd");
   SmtpMail.SmtpServer = "smtp.tom.com";
  SmtpMail.Send(msgTo);
}