public IHttpActionResult GetForUser(DateTime tarih, int doktorId, int kullaniciId)
        {
            RandevuBLL randevuBusiness = new RandevuBLL();
            var        model           = randevuBusiness.GetForUser(tarih, doktorId, kullaniciId);

            if (model == null)
            {
                return(NotFound());
            }
            else
            {
                return(Ok(model));
            }
        }