Wait until app gets authorization with SpotifyAPI-Net 5.1.1

Question

I want my app to first get authorization and then do something with it, e.g. display user's name. The following code returns an error.

SpotifyWebApi api;

// (1) Get authorization (code from the official guide)
AuthorizationCodeAuth auth = new AuthorizationCodeAuth(
                "http://localhost:4002",
                "http://localhost:4002",
                Scope.UserReadPrivate | Scope.UserReadEmail
);

auth.AuthReceived += async (sender, payload) =>
{
    auth.Stop();
    Token token = await auth.ExchangeCode(payload.Code);
    api = new SpotifyWebAPI()
    {
        TokenType = token.TokenType,
        AccessToken = token.AccessToken
    };
};
auth.Start();
auth.OpenBrowser();

// (2) Get user's data
PrivateProfile apiUser = api.GetPrivateProfile();
Console.WriteLine(apiUser.DisplayName);

The problem is that the (2) code executes before it obtains the necessary authorization that (1) should provide, therefore, api.GetPrivateProfile() returns null. What should I do?