public static List<List<Product>> GetPages(this List<Product> listOfProducts, int pageSize, int pageNumber)
        {
            List<List<Product>> allPages = new List<List<Product>>();
            for (int i = 0; i<pageNumber; i++)
            {
                allPages.Add(listOfProducts.Skip(pageSize * pageNumber).Take(pageSize).ToList());
            }

            return allPages;
        }