Get GUID from Active Directory Using Asp.net

I have a VB ASP.Net web application, in which the user logs in via Active Directory. I am looking to retrieve the GUID from the logged in user using asp.net VB. I am lost in retrieving the GUID; I am not sure if it is possible. Do I have to get the username first and then do a lookup to get the GUID? Any advice is much appreciated.
leevjohnAsked:
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Anurag ThakurTechnical ManagerCommented:
the link shows how to fetch information from the active directory and when the information is fetched how it has to be retrieved
http://weblogs.asp.net/jpinquie/archive/2008/02/06/how-to-get-domain-user-information-from-active-directory-in-c.aspx

once the information has been brought then you can use SID to retrieve the GUID
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leevjohnAuthor Commented:
This is good solution and in VB.
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