public Tuple <long, Hardware, List <ProductSupplier>, List <ProductDetail>, List <PurchaseItem> > GetAllHardwareOfProduct(long productID)
{
Hardware hardware = FindById(productID);
List <ProductSupplier> productSuppliers = repositoryProductSupplier.GetAllProductSuppliersPerProduct(productID);
List <ProductDetail> productDetails = repositoryProductDetail.GetAllProductDetailsPerProduct(productID);
List <PurchaseItem> purchaseItems = repositoryPurchaseItem.GetAllPurchaseItemsOfProduct(productID);
return(new Tuple <long, Hardware, List <ProductSupplier>, List <ProductDetail>, List <PurchaseItem> >(productID, hardware, productSuppliers, productDetails, purchaseItems));
}