testapps/ContosoUniversityWeb/Pages/Students/Create.cshtml.cs

using ContosoUniversity.Models;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using System;
using System.Threading.Tasks;

namespace ContosoUniversity.Pages.Students
{
    public class CreateModel : PageModel
    {
        private readonly ContosoUniversity.Data.SchoolContext _context;

        public CreateModel(ContosoUniversity.Data.SchoolContext context)
        {
            _context = context;
        }

        public IActionResult OnGet()
        {
            Student = new Student
            {
                EnrollmentDate = DateTime.Now,
                FirstMidName = "Joe",
                LastName = "Smith"
            };
            return Page();
        }

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

        public async Task<IActionResult> OnPostAsync()
        {
            var emptyStudent = new Student();

            if (await TryUpdateModelAsync<Student>(
                emptyStudent,
                "student",   // Prefix for form value.
                s => s.FirstMidName, s => s.LastName, s => s.EnrollmentDate))
            {
                _context.Students.Add(emptyStudent);
                await _context.SaveChangesAsync();
                return RedirectToPage("./Index");
            }

            return Page();
        }
    }
}