public ShoppingCartUI(IShoppingCartBL IShoppingCartBL, IHttpContextAccessor HttpContextAccessor)
 {
     _iShoppingCartBL     = IShoppingCartBL;
     _httpContextAccessor = HttpContextAccessor;
 }
 //creating reference for interface
 public CartController()
 {
     productCategoryBL = new ProductCategoryBL();
     productBL         = new ProductBL();
     ShoppingCartBL    = new ShoppingCartBL();
 }