public IActionResult Register(User FormUser)
        {
            var output = Database.User.Count(u => u.Email == FormUser.Email);

            if (output == 1)
            {
                TempData["Error"] = "That user already exists.";
                return(View());
            }
            else
            {
                HttpContext.Session.SetString("Email", FormUser.Email.ToString());
                UserEmail         = HttpContext.Session.GetString("Email");
                TempData["Email"] = HttpContext.Session.GetString("Email");
                Database.Add(FormUser);
                Database.SaveChanges();
                return(View(FormUser));
            }
        }