public ActionResult Create(TreatmentCreateViewModel model)
        {
            if (ModelState.IsValid)
            {
                List<Therapist> allThera = new List<Therapist>();
                foreach (int id in model.SelectedTherapistId)
                {
                    Therapist thera = service.TherapistGateway.GetOne(id);
                    allThera.Add(thera);
                }
                Treatment treatment = new Treatment
                {
                    Name = model.Name,
                    Description = model.Description,
                    Price = model.Price,
                    Duration = model.Duration,
                    TreatmentTypeId = model.SelectedTypeId,
                    Therapists = allThera
                };

                service.TreatmentGateway.CreateOne(treatment);
                return RedirectToAction("Index");
            }
            return View();
        }
 // GET: Treatment/Create
 public ActionResult Create()
 {
     var model = new TreatmentCreateViewModel
     {
         Therap = GetTherapists(),
         Types = GetTypes()
     };
     return View(model);
 }