ASP.NET Core Identity Extend Not Saving - asp.net-core

Question

I'm attempting to extend the ASP.NET Identity. I feel like I have most of the parts. The model and user objects all properly populate. However, when I check the database for the new record inserted via the CreateAsync function, the new fields are all NULL. What am I missing?
[HttpPost]
[AllowAnonymous]
[ValidateAntiForgeryToken]
public async Task<IActionResult> Register(RegisterViewModel model, string returnUrl = null)
{
ViewData["ReturnUrl"] = returnUrl;
if (ModelState.IsValid)
{
var user = new ApplicationUser { UserName = model.Email, Email = model.Email, FirstName = model.FirstName, LastName = model.LastName
, Organization = model.Organization };
var result = await _userManager.CreateAsync(user, model.Password);
if (result.Succeeded)
{
_logger.LogInformation("User created a new account with password.");
var code = await _userManager.GenerateEmailConfirmationTokenAsync(user);
var callbackUrl = Url.EmailConfirmationLink(user.Id.ToString(), code, Request.Scheme);
await _emailSender.SendEmailConfirmationAsync(model.Email, callbackUrl);
await _signInManager.SignInAsync(user, isPersistent: false);
_logger.LogInformation("User created a new account with password.");
return RedirectToLocal(returnUrl);
}
AddErrors(result);
}
// If we got this far, something failed, redisplay form
return View(model);
}
services.AddIdentity<ApplicationUser, IdentityRole>(options =>
{
// Signin settings
options.SignIn.RequireConfirmedEmail = false;
options.SignIn.RequireConfirmedPhoneNumber = false;
})
.AddEntityFrameworkStores<ApplicationDbContext>()
.AddDefaultTokenProviders();
public class ApplicationUser : IdentityUser
{
public String FirstName;
public String LastName;
public String Organization;
}

Answer 1

You need to use auto-implemented properties in your ApplicationUser class instead of just using public fields. That might be the problem.
public class ApplicationUser : IdentityUser
{
public String FirstName { get; set; }
public String LastName { get; set; }
public String Organization { get; set; }
}