请问用MailMessage发送Base64邮件怎么实现？

[flyxing]

如题，谢谢

[贝贝壳壳]

MailAttachment ma=new MailAttachment(filename,MailEncoding.Base64);
MailMessage mm=new MailMessage ();
mm.Subject=...
mm.Body=...

mm.Attachments .Add(ma);

SmtpMail.SmtpServer = sMailServer;
SmtpMail.Send(mm);