Get GUID from Active Directory Using

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 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.
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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

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