User.Identity.GetUserId() returns null after successful login

Question

I\'ve defined a temp variable to get current user id, it always returns null.

Here is the snapshot:

Why?

UPDATE:

Answer 1

Here's what worked for me:

await SignInManager.SignInAsync(user, isPersistent: true, rememberBrowser: false);

AuthenticationManager.User = new GenericPrincipal(AuthenticationManager.AuthenticationResponseGrant.Identity, null);

Once executed, you get authenticated state for the current request.