I am trying to get a list of all firstname, lastname from AD. This is what I have so far:
DirectoryEntry entry = new DirectoryEntry( "LDAP://MyCompany.net", "username", "password") ;

DirectorySearch er search = new DirectorySearch er(entry);
search.Filter =(&(objectCateg ory=user)(objec tClass=Person)) ;
search.Properti esToLoad.Add("c n");
search.Properti esToLoad.Add("f irstname");...