public async Task <IActionResult> Editad(int adid)
        {
            var advertisement = await _advertisementRepository.GetAdvertisementByAdId(adid);

            if (advertisement == null)
            {
                return(NotFound());
            }
            else
            {
                if (_userService.GetUserId() == advertisement.Userid)
                {
                    return(View(advertisement));
                }
                else
                {
                    return(RedirectToAction("managead", "Advertisement"));
                }
            }
        }