Как опубликовать данные в приложении Razor Page Asp.net

Я пытаюсь выполнить CRUD в ASP.net 6, но у меня возникают трудности с размещением моих данных в базе данных. Я считаю, что данные моей формы недействительны из-за моих списков выбора, но я не уверен. Ниже показано, как выглядит мой код.

 public class CreateModel : StudentSelectListPageModel
    {
        private readonly ThreeTierAdvisementApp.Data.AdvisementDbContext _context;

        public CreateModel(ThreeTierAdvisementApp.Data.AdvisementDbContext context)
        {
            _context = context;
        }

        public IActionResult OnGet()
        {
            PopulateDropDownList(_context);
     
            return Page();
        }

        [BindProperty]
        public Student Student { get; set; }


        // To protect from overposting attacks, see https://aka.ms/RazorPagesCRUD
        public async Task<IActionResult> OnPostAsync()
        {
            var emptyStudent = new Student();
            var emptyAdvisor = new Advisor();
            //var emptyMajor = new Major();

            if (await TryUpdateModelAsync<Student>(
                emptyStudent, "student",
                s => s.ID, s => s.Name, s => s.Address, s => s.PhoneNumber, s => s.Email, s => s.Major, s => s.Status, s => s.Advisor))
            {
                _context.Students.Add(emptyStudent);
                await _context.SaveChangesAsync();
                return RedirectToPage("./Index");
            }

            PopulateDropDownList(_context);

            return Page();
        }
    }

 public class StudentSelectListPageModel : PageModel
    {
        public SelectList AdvisementNameSL { get; set; }
        public SelectList MajorNameSL { get; set; }
        public SelectList StatusNameSL { get; set; }


        public void PopulateDropDownList(AdvisementDbContext _context)
        {
            var advisorQuery = from d in _context.Advisors
                               orderby d.Name // Sort by name.
                               select d;

            var majorQuery = from d in _context.Students
                             orderby d.Major // Sort by name.
                             select d;

            var statusQuery = from d in _context.Students
                              orderby d.Name // Sort by name.
                              select d;

            AdvisementNameSL = new SelectList(advisorQuery.AsNoTracking(),
                        "ID", "Name");

            MajorNameSL = new SelectList(majorQuery.AsNoTracking(),
                        "ID", "MajorID");

            StatusNameSL = new SelectList(statusQuery.AsNoTracking(),
                      "ID", "Status");
        }
    }

 <div class = "col-md-4">
        <form method = "post">
            <div asp-validation-summary = "ModelOnly" class = "text-danger"></div>
            <div class = "form-group">
                <label asp-for = "Student.ID" class = "control-label"></label>
                <input asp-for = "Student.ID" class = "form-control" />
                <span asp-validation-for = "Student.ID" class = "text-danger"></span>
            </div>
            <div class = "form-group">
                <label asp-for = "Student.Name" class = "control-label"></label>
                <input asp-for = "Student.Name" class = "form-control" />
                <span asp-validation-for = "Student.Name" class = "text-danger"></span>
            </div>
            <div class = "form-group">
                <label asp-for = "Student.Address" class = "control-label"></label>
                <input asp-for = "Student.Address" class = "form-control" />
                <span asp-validation-for = "Student.Address" class = "text-danger"></span>
            </div>
            <div class = "form-group">
                <label asp-for = "Student.PhoneNumber" class = "control-label"></label>
                <input asp-for = "Student.PhoneNumber" class = "form-control" />
                <span asp-validation-for = "Student.PhoneNumber" class = "text-danger"></span>
            </div>
            <div class = "form-group">
                <label asp-for = "Student.Email" class = "control-label"></label>
                <input asp-for = "Student.Email" class = "form-control" />
                <span asp-validation-for = "Student.Email" class = "text-danger"></span>
            </div>
            <div class = "form-group">
                <label asp-for = "Student.MajorID" class = "control-label"></label>
                <select asp-for = "Student.Major" class = "form-control" asp-items = "@Model.MajorNameSL"><option value = "">-- Select Major --</option></select>
            </div>
            <div class = "form-group">
                <label asp-for = "Student.Status" class = "control-label"></label>
                <select asp-for = "Student.ID" class = "form-control" asp-items = "@Model.StatusNameSL"><option value = "">-- Select Status --</option></select>
                <span asp-validation-for = "Student.Status"  class = "text-danger"></span>
            </div>
            <div class = "form-group">
                <label asp-for = "Student.AdvisorID" class = "control-label"></label>
                <select asp-for = "Student.AdvisorID" class = "form-control" asp-items = "@Model.AdvisementNameSL"><option value = "">-- Select Advisor --</option></select>
            </div>
           
            <div class = "form-group">
                <input type = "submit" value = "Create" class = "btn btn-primary" />
            </div>
        </form>
    </div>

Когда я пытаюсь выполнить отладку, я замечаю, что заполняются только отдельные входы, а раскрывающиеся меню - нет. Могу ли я получить руководство, как правильно настроить раскрывающиеся списки.