How to detect anonymous profile

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I am learning how to use Profile that comes with Membership and Role in .NET. However, I am not sure where is the top of the chain to set the value:

//Q1. Does it mean I set auth manually when loading user, or create it if not already exists? 
//Or am I meant to get the isauth value from somewhere and pass it in?
var currentUserProfile = ProfileBase.Create(Membership.GetUser().UserName, isauth);
var anyUserProfile = ProfileBase.Create(strNewUser, isauth);
//isauth: true to indicate the user is authenticated;
//        false to indicate the user is anonymous.

And to get the value:

//Q2. Are res1 and res2 below reflecting the same thing?
//Gets a value that indicates whether the user has been authenticated
bool res1 = HttpContext.Current.User.Identity.IsAuthenticated;
//Gets a value indicating whether the user profile is for an anonymous user
bool res2 = HttpContext.Current.Profile.IsAnonymous;

I am confused about the relations of auth/anonymous in each of them. Which one is the correct way to get/set user to be authenticated or anonymous? My goal here is to enable both anonymous users and authenticated users to have a profile.

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Nitin Sawant On BEST ANSWER

The res1 and res2 are different as its values depend on the settings in IIS config.

You can enable the "Anonymous Access" in IIS to bind the anonymous identity with a User Account

From Codeproject:
if you run this code in IIS6 under anonymous mode you will get no details as shown below. enter image description here

Take a look at following article on asp.net authentication and authorizaion:
http://www.codeproject.com/Articles/98950/ASP-NET-authentication-and-authorization

In IIS7 you can navigate to Security >> Authentication as follows:

enter image description here

enter image description here