public IActionResult OnGet(int?CategoryId)
        {
            Categories = new Categories();
            if (CategoryId == null)
            {
                //   PopulateCategoryDropDownList(db);
                return(Page());
            }

            Categories = repositoryData.GetCategories_ById((int)CategoryId);

            if (Categories == null)
            {
                return(NotFound());
            }


            return(Page());
        }
 public Categories Get(int id)
 {
     return(repositoryData.GetCategories_ById(id));
 }