public async Task <DersResponse> GetAsync(string ad)
        {
            DersResponse dersResponse = new DersResponse();
            var          ders         = await _dersRepository.GetAsync(ad);

            if (ders == null)
            {
                dersResponse.Message = "Aranan isimde Ders Bulunamadı.";
            }
            else
            {
                dersResponse.Entities.Add(ders);
            }

            return(dersResponse);
        }
        public async Task <DersResponse> GetAllAsync()
        {
            //TODO: Paging...

            DersResponse dersResponse         = new DersResponse();
            IEnumerable <Models.Ders> dersler = await _dersRepository.GetAllAsync();

            if (dersler.ToList().Count == 0)
            {
                dersResponse.Message = "İlgili Derler Bulunumadı.";
            }
            else
            {
                dersResponse.Entities.AddRange(dersler);
            }

            return(dersResponse);
        }