Why this Model Binding not working in Razor Page - asp.net-core

Question

I am using ASP.NET Core 3.1 with a simple example to test model binding to post a form. The property to be bound is an object named "Student". Bud the model binding is not working with post method. I will appreciate any help to point out what's wrong here.
Here are the code of my test programs:
'Student Class':
namespace ModelBindPost.Models
{
public class Student
{
public int Id;
public string FirstName;
public string LastName;
}
}
'Edit.cshtml.cs'
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using ModelBindPost.Models;
namespace ModelBindPost.Pages
{
public class EditModel : PageModel
{
[BindProperty(SupportsGet = true)]
public Student Student { get; set; }
public EditModel()
{
Student = new Student();
}
public IActionResult OnGet()
{
Student.Id = 1;
Student.FirstName = "Jean";
Student.LastName = "Smith";
return Page();
}
public IActionResult OnPost()
{
string name = this.Student.FirstName;
return Page();
}
}
}
' Edit.cshtml':
#page
#model ModelBindPost.Pages.EditModel
#{
}
<h2>Model Binding Test</h2>
<form method="post">
<div class="form-group">
<lable asp-for="Student.Id"></lable>
<input asp-for="Student.Id" class="form-control" />
</div>
<div class="form-group">
<lable asp-for="Student.FirstName"></lable>
<input asp-for="Student.FirstName" class="form-control" />
</div>
<div class="form-group">
<lable asp-for="Student.LastName"></lable>
<input asp-for="Student.LastName" class="form-control" />
</div>
<button type="submit" class="btn btn-primary">Save</button>
</form>

Answer 1

A simple public field cannot work for model binding. You need add getter and setter to create property like below:
public class Student
{
public int Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
}