Get data from ActiveDirectory with C#...

Hi,
I need to retrieve data from ActiveDirectory (AD is new for me).
There is a code which return a DataSet from the AD (which was writen by someone else).
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            public static DataSet ExecuteDataset(string strSql)
            {
                  OleDbConnection con;
                  OleDbDataAdapter adapter;
                  DataSet ds = new DataSet();

                  con = new OleDbConnection("Provider=ADSDSOObject;User ID=" + PriviligeUser + ";Password=" + PriviligeUserPass + ";Encrypt Password=True;ADSI Flag=1");
                  adapter = new OleDbDataAdapter(strSql, con);
                  adapter.Fill(ds);
                  return ds;
            }
----------------------------------------------------------------------------------------
Lets say i need to get all the users that the ID Number (is there a field by that name in the AD??) is not NULL.
What is the right SQL statment that i have to pass to that function in order to get what i need??
(Is there a table? i meen - what table name do i need to write - SELECT FROM ???......)
Thanks
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udirAsked:
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stanscott2Commented:
Hi, this is really more than can be answered in a few questions.  Fortunately, the 15 Seconds site sets it all out very clearly here:  http://www.15seconds.com/issue/020730, "Accessing Active Directory Through the .NET Framework".

This article also includes a lot of downloadable code you can snap in -- it provides a wrapper class so that you can easily work with Active Directory user information.
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udirAuthor Commented:
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