List<string> listManufacturer = new List<string>();
            listManufacturer.Add("Все производители");
            foreach (Product product in BaseConnect.BaseModel.Product.ToList())
            {
                string Manuf = product.ProductManufacturer;
                listManufacturer.Add(Manuf);
            }
            cbManufact.ItemsSource = listManufacturer.Distinct();