check if user belong to a domain against active directory without impersonation

I just get stuck on how to check if a user is a member of network (domain).
I am building an internal tracking system with ASP.Net with Form
authentication. When an user is added into the system, it check if the user
is a member of the domain account against Global Catalog. If not, the user
is not allowed to added in. If is, get the user's first name and last name
and insert into the database.
Because the system need access to other resource, I don't want to use
impersonation. Changing WindonIdentity with impersonation at run time is
also not a choice because the web server is running on Windows 2000. Based
on the Security context, how to check if a user in the system or not? Thank
you in advance.

--Caspy


.

Relevant Pages

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