public AdminCategories Exec(SqlConnection db, int skip, int take)
        {
            var ret = new AdminCategories();

            foreach (var item in repository.CategoryList(db, skip, take, ref ret.total))
            {
                ret.list.Add(new AdminCategory
                {
                    Id   = item.Id,
                    Name = item.Name
                });
            }

            return(ret);
        }