Write code in C # to send mail

Send mail the System.Web.Mail namespace in the. Net Framework provides a class smtpmail for sending e-mail messages, the following is the code for which I send the message:

MailMessage mm=new MailMessage ();

Mm. From= "Lixun007@163.net";
Mm. To= "Bill@Microsoft.com";
Mm. Subject= "received a reply";
Mm. Body= "Why the server properties of the SMTP class do not provide password Authentication";
Mm. Attachments.Add (New MailAttachment ("C:\\Test.txt"));
Attachments implement IList interface, you can add multiple attachments

Smtpmail.smtpserver= "webmail.careland.com.cn";
Set up SMTP server to send mail, no login method for server requiring authentication currently available
For example, 163.net,163.com, I am currently my company's SMTP server
See if there's a better way for everyone.
Smtpmail.send (mm);

MessageBox.Show ("OK");
Test pass on the Win2000