public IQueryable <ProductCategoryMap> GetProductCategoryMap()
        {
            List <ProductCategoryMap> result = new List <ProductCategoryMap>();

            for (int i = 1; i < 101; i++)
            {
                for (int x = 10; x < 15; x++)
                {
                    ProductCategoryMap map = new ProductCategoryMap();
                    map.ProductID  = i;
                    map.CategoryID = x;
                    result.Add(map);
                }
            }
            return(result.AsQueryable());
        }
        public IQueryable<ProductCategoryMap> GetProductCategoryMap() {
            List<ProductCategoryMap> result = new List<ProductCategoryMap>();
            for (int i = 1; i < 101; i++) {
                
                for (int x = 10; x < 15; x++) {
                    ProductCategoryMap map = new ProductCategoryMap();
                    map.ProductID = i;
                    map.CategoryID = x;
                    result.Add(map);
                }

            }
            return result.AsQueryable();
        }