20210216_SendOrderEmail_withRazor.cs

[HttpPost]
public ActionResult SendOrderEmail()
{
  var order = Models.OrderUtil.GetTestOrder();

  string subject = "測試主旨";

  ViewBag.remark = "寄送時間：" + DateTime.Now;
  string body = JZLib.JZUtil.RenderViewToString(ControllerContext, "_OrderEmailTemplate", order);

  using (SmtpClient smtp = new SmtpClient("your.smtp.server"))
  {
    smtp.Send(new MailMessage("noreply@jzcorp.com", order.customer_email)
    {
      Subject = subject,
      Body = body,
      IsBodyHtml = true
    });
  }

  return View("MailSent");
}