using System.Web.Mail to send email

there are many demos for send a email with c sharp language .however,you will find that most of them will be failed because of SMTPServer.Especially,authorization is required.

publicvoidSendEMail()
...{
MailMessagemail=newMailMessage();
mail.Priority=MailPriority.High;
mail.From="cccc@gmail.com";
mail.To="cccc@163.com";
mail.Subject="SendEMailSystemDemo";
mail.Body="Justfortest.";
mail.BodyEncoding=Encoding.UTF8;

//authorization
mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusing",1);
mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendemailaddress",mail.From);
mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpuserreplyemailaddress",mail.From);
mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpaccountname","cccc@163.com");
mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword","cccc");
mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate",1);
mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpserver","smtp.163.com");

SmtpMail.SmtpServer="smtp.163.com";
SmtpMail.Send(mail);
}
#endregion