public ActionResult CreateMember([Bind(Exclude = "registerDate")] member m) { m.registerDate = DateTime.Now; if (!ModelState.IsValid) { return(View(m)); } bool flag = memberDao.FindByUsername(m.username); if (flag) { ViewBag.Error = "Username has existed"; return(View(m)); } member member = memberDao.Save(m); if (member is null) { ViewBag.Error = "Create member failed"; return(View(m)); } return(RedirectToAction("GetMembers")); }