public ShoppingCategoryListDto(ShoppingCategoryList shoppingCategoryList)
 {
     ShoppingCategoryListId = shoppingCategoryList.ShoppingCategoryListId;
     UserId = shoppingCategoryList.UserId;
     Title = shoppingCategoryList.Title;
     ShoppingItems = new List<ShoppingItemDto>();
     foreach (ShoppingItem item in shoppingCategoryList.ShoppingItems)
     {
         ShoppingItems.Add(new ShoppingItemDto(item));
     }
 }
        public ShoppingCategoryList ToEntity()
        {
            ShoppingCategoryList shoppingItem = new ShoppingCategoryList
            {
                Title = Title,
                ShoppingCategoryListId = ShoppingCategoryListId,
                UserId = UserId,
                ShoppingItems = new List<ShoppingItem>()
            };
            foreach (ShoppingItemDto item in ShoppingItems)
            {
                shoppingItem.ShoppingItems.Add(item.ToEntity());
            }

            return shoppingItem;
        }