Ldap module and active directory

[Jeffery H. <je...@uv...>]

Dear all,
     I tried to write a simple program to query microsoft active 
directory data use Net::LDAP.
I have binded it successful, but I cannot query it! I use the same 
command from ldap browser,
it can query my data. my query string like that:
 
       $querystring = "cn=HuangJeffery,cn=Users,dc=mydomain,dc=com";

What's problem here! does anyone success to access AD use perl module?
How to use it!

Thank you!

Regard,
Jeffery