Webchat:Register

AuthRegisterController.cshtml

public ActionResult Register(){
        string user_name = Request.Form["regname"];
        string user_pwd = Request.Form["regpass"];
        string user_repwd = Request.Form["reregpass"];

        if (user_name.Trim() == "" || user_pwd.Trim() == "")
        {
            return Redirect("/");
        }
        if(user_pwd != user_repwd)
        {
            return Redirect("/");
        }

        using (var db = new Models.ChatContext())
        {
            User user = db.Users.FirstOrDefault(u => u.name == user_name);

            if (user == null)
            {
                user = new User { name = user_name, pwd = user_pwd, created_at = DateTime.Now };

                db.Users.Add(user);
                db.SaveChanges();
            }
            else
            {
                return Redirect("/");
            }
            Session["user"] = user;
        }

        return Redirect("/chat");
}