easy, too easy;

--------------------code---------------------

private void sengmill_net()
{//.net smtp类进行邮件发送，支持认证，附件添加；
System.Web.Mail.MailMessage mailmsg = new System.Web.Mail.MailMessage();
mailmsg.From = this.tb_from.Text.Trim();
mailmsg.To = this.tb_to.Text.Trim();
mailmsg.Body = this.tb_mailBody.Text.Trim();
mailmsg.Subject = "test mail from hz";
/* 附件的粘贴, ^_^,笨了点;
if(this.att1.Value.ToString().Trim()!=string.Empty)
mailmsg.Attachments.Add(new System.Web.Mail.MailAttachment(this.att1.Value.ToString().Trim()));
if(this.att2.Value.ToString().Trim()!=string.Empty)
mailmsg.Attachments.Add(new System.Web.Mail.MailAttachment(this.att2.Value.ToString().Trim()));
if(this.att3.Value.ToString().Trim()!=string.Empty)
mailmsg.Attachments.Add(new System.Web.Mail.MailAttachment(this.att3.Value.ToString().Trim()));
*/
mailmsg.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1");
//是否需要验证，一般是要的
mailmsg.Fields.Add
("http://schemas.microsoft.com/cdo/configuration/sendusername", "gallon_han");
//自己邮箱的用户名
mailmsg.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", "218500");
//自己邮箱的密码
System.Web.Mail.SmtpMail.SmtpServer = this.tb_smtpserver.Text.Trim();
System.Web.Mail.SmtpMail.Send(mailmsg);
}