public void AddElement(KitchenBindingModel model)
        {
            int maxId = 0;

            for (int i = 0; i < source.Kitchens.Count; ++i)
            {
                if (source.Kitchens[i].Id > maxId)
                {
                    maxId = source.Kitchens[i].Id;
                }
                if (source.Kitchens[i].KitchenName == model.KitchenName)
                {
                    throw new Exception("Уже есть склад с таким названием");
                }
            }
            source.Kitchens.Add(new Kitchen
            {
                Id          = maxId + 1,
                KitchenName = model.KitchenName
            });
        }
        public void UpdElement(KitchenBindingModel model)
        {
            int index = -1;

            for (int i = 0; i < source.Kitchens.Count; ++i)
            {
                if (source.Kitchens[i].Id == model.Id)
                {
                    index = i;
                }
                if (source.Kitchens[i].KitchenName == model.KitchenName &&
                    source.Kitchens[i].Id != model.Id)
                {
                    throw new Exception("Уже есть склад с таким названием");
                }
            }
            if (index == -1)
            {
                throw new Exception("Элемент не найден");
            }
            source.Kitchens[index].KitchenName = model.KitchenName;
        }