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Acquisition of AD OU List

I am looking to be able to pull a list of the current OU from Active Directory. I have ever searched for some kind of code example on the Internet, but O doesn't seem to be able to get this to work.

        string defaultNamingContext;

        DirectoryEntry rootDSE = new DirectoryEntry("LDAP://RootDSE");
        defaultNamingContext = rootDSE.Properties["defaultNamingContext"].Value.ToString();
        DirectorySearcher ouSearch = new DirectorySearcher(rootDSE, "(objectClass=organizationalUnit)", 
            null, SearchScope.Subtree);

        MessageBox.Show(rootDSE.ToString());
        try
        {
            SearchResultCollection collectedResult = ouSearch.FindAll();
            foreach (SearchResult temp in collectedResult)
            {
                comboBox1.Items.Add(temp.Properties["name"][0]);
                DirectoryEntry ou = temp.GetDirectoryEntry();
            }

The error I get: the provider does not support the search and cannot search LDAP: // RootDSE any ideas? for each of the returned search results, I want to add them to the combo box. (shouldn't be too hard)

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2 answers

LDAP://RootDSE - "" . . :

string defaultNamingContext;

DirectoryEntry rootDSE = new DirectoryEntry("LDAP://RootDSE");
defaultNamingContext = rootDSE.Properties["defaultNamingContext"].Value.ToString();

DirectoryEntry default = new DirectoryEntry("LDAP://" + defaultNamingContext);

DirectorySearcher ouSearch = new DirectorySearcher(default, 
                                     "(objectClass=organizationalUnit)", 
                                     null, SearchScope.Subtree);

, , OU .

, objectClass - AD. objectCategory, :

DirectorySearcher ouSearch = new DirectorySearcher(default, 
                                     "(objectCategory=Organizational-Unit)", 
                                     null, SearchScope.Subtree);

UPDATE:
, - objectCategory CN=Organizational-Unit,..... ADSI-, objectCategory=organizationalUnit :

DirectorySearcher ouSearch = new DirectorySearcher(default, 
                                     "(objectCategory=organizationalUnit)", 
                                     null, SearchScope.Subtree);
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