public void Delete(Brand t)
{
Products.RemoveAll(s => s.Brand == t.Name);
Sellers.ForEach(seller => seller.Products.RemoveAll(product => product.Brand == t.Name));
var result = Brands.RemoveAll(brand => brand.Name == t.Name);
DeleteBrandsAndSellersWithNoProducts();
}
private void DeleteBrandsAndSellersWithNoProducts()
{
Sellers.RemoveAll(s => s.Products.Count == 0);
Brands.RemoveAll(s => s.Products.Count == 0);
}
