C# WinForm发送Email邮件

        private void simpleButton3_Click(object sender, EventArgs e)

        {
             //发送
            SmtpClient client = new SmtpClient("smtp.qq.com");   //设置邮件协议
            client.EnableSsl = true;
            client.UseDefaultCredentials = false;//这一句得写前面
            client.DeliveryMethod = SmtpDeliveryMethod.Network; //通过网络发送到Smtp服务器
            client.Credentials = new NetworkCredential("000000000@qq.com", "ywufrjewunxfbuuu"); //qq邮箱  和 授权码
            MailMessage mmsg = new MailMessage(new MailAddress("000000000@qq.com"), new MailAddress("111111111@qq.com")); //发件人和收件人的邮箱地址
            mmsg.Subject = "测试";      //邮件主题
            mmsg.SubjectEncoding = Encoding.UTF8;   //主题编码
            mmsg.Body = "测试";         //邮件正文
            mmsg.BodyEncoding = Encoding.UTF8;      //正文编码
            mmsg.IsBodyHtml = true;    //设置为HTML格式          
            mmsg.Priority = MailPriority.High;   //优先级         
            try
            {
                client.Send(mmsg);
                MessageBox.Show("邮件已发成功");
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        
        }