Sorry for being an uber pain people, its all very new :(

Already had alot of help on this, but don't seem to be able to see the problem, I am trying to populate a combo box with a list of all the current OU's, later to send each machine within that OU a shutdown command. (Acquiring AD OU list & Active Directory list OU's) were my previous Q's.

        string defaultNamingContext;
        //TODO 0 - Acquire and display the available OU's
        DirectoryEntry rootDSE = new DirectoryEntry("LDAP://RootDSE");
        defaultNamingContext = rootDSE.Properties["defaultNamingContext"].Value.ToString();
        DirectoryEntry entryToQuery = new DirectoryEntry ("LDAP://" + defaultNamingContext);
        MessageBox.Show(entryToQuery.Path.ToString());

        DirectorySearcher ouSearch = new DirectorySearcher(entryToQuery.Path);
        ouSearch.Filter = "(objectCatergory=organizationalUnit)";
        ouSearch.SearchScope = SearchScope.Subtree;
        ouSearch.PropertiesToLoad.Add("name");

        SearchResultCollection allOUS = ouSearch.FindAll();

        foreach (SearchResult oneResult in allOUS)
        {
            //comboBox1.Items.Add(oneResult.ToString());
            comboBox1.Items.Add(oneResult.Properties["name"][0]);
        }

I have been through and debugged everything i know, the searcher isn't picking up any results, hence why nothing is populated in the combo box.