c#实现简单的发送邮件

        try
            {
                //准备邮件内容
                MailMessage message = new MailMessage                  ("abc@163.com", "abc@163.com", "测试邮件发送", "查看附件 ");
                message.Attachments.Add(new Attachment(@"D:/a.txt"));
                message.PRiority = MailPriority.High;
                message.IsBodyHtml = false;

                 //准备安全凭证
                   NetworkCredential nc= new NetworkCredential("abc","邮箱密码");

                 //准备SMTP,发送电子邮件
                   SmtpClient client = new SmtpClient("smtp.163.com",25);
                client.DeliveryMethod = SmtpDeliveryMethod.Network;
                client.Credentials = nc;
                client.Send(message);
                MessageBox.Show("邮件发送成功!!");
            }
            catch (FormatException ex)
            {
                MessageBox.Show(ex.Message);
            }
            catch (SmtpException ex)
            {
                MessageBox.Show(ex.Message);
            }