public IActionResult OnPost(int mentorId)
        {
            var mentor = mentorData.Delete(mentorId);

            mentorData.Commit();
            if (mentor == null)
            {
                return(RedirectToPage("./NotFound"));
            }
            TempData["Message"] = $"{mentor.Name} is successfully deleted!";
            return(RedirectToPage("./MentorList"));
        }