public Cookie Update(Cookie updatedCookie)
        {
            var cookie = cookies.SingleOrDefault(c => c.Id == updatedCookie.Id);

            if (cookie != null)
            {
                cookie.Name     = updatedCookie.Name;
                cookie.Diameter = updatedCookie.Diameter;
                cookie.Type     = updatedCookie.Type;
            }

            return(cookie);
        }
 public Cookie Add(Cookie newCookie)
 {
     cookies.Add(newCookie);
     newCookie.Id = cookies.Max(c => c.Id) + 1;
     return(newCookie);
 }