Sorry,
I found the answer on dunnrys piece on "Common System.DirectoryServices Patterns".
However, my other problems still manifest itself.
i.e
I have 2 textboxes, one for "givenname" and one for "sn" (I am building an addressbook, go figure ;-)
in my query I am using the * in order to perform a LIKE search on whatever is put into the textboxes.
In order for a post to be found, it needs to contain a value in both attributes.
I.e. even though I might only put a value in the "givenname" textbox and leave the "sn" blank.
It will only return values that fits the search criteria AND that has a value in the "sn" field.
It will NOT display values that fits the search criteria and does not have a value in the "sn" field.
regards
Patrik