最简单的发送附件的例子，给SMITHPENG

 try
        {
            MailMessage oMail = new MailMessage();
            Console.WriteLine("Mail Created");
            oMail.To = "yateent@hotmail.com";
            oMail.Cc = "yateen_thakkar@syntelinc.com";
            oMail.From = "yateent@hotmail.com";
            oMail.Subject = "Hi Yateen";
            oMail.BodyFormat = MailFormat.Html;
            string strBody = "<b>Hello <i>Yateen</i></b>" +
                                   " This is from <font color=red>.NET</font>";
            oMail.Body = strBody;
oMail.Attachments.Add(new MailAttachment("c:\aishwarya1.jpg"));
            SmtpMail.Send(oMail);
            Console.WriteLine("Mail Sent");
        }
        catch(Exception ex)
       {
           Console.WriteLine("Error : " + ex.Message);
        }

原文转自：http://www.ltesting.net