I have been banging my head for quite a while with this and can't get it to work. I have a LDAP Query I do have working in AD Users and Computers but dont know how to do it programatically in C#.

Here are my LDAP Query that works fine in the AD Tool: (memberOf=CN=AccRght,OU=Groups,OU=P,OU=Server,DC=mydomain,DC=com)(objectCategory=user)(objectClass=user)(l=City)

I have used this code to get the user accounts to get members of CN=AccRght but I'm not succeeding on limiting users belonging to a specific city.

public StringCollection GetGroupMembers(string strDomain, string strGroup)
{
    StringCollection groupMemebers = new StringCollection();
    try
    {
        DirectoryEntry ent = new DirectoryEntry("LDAP://DC=" + strDomain + ",DC=com");
        DirectorySearcher srch = new DirectorySearcher("(CN=" + strGroup + ")");
        SearchResultCollection coll = srch.FindAll();
        foreach (SearchResult rs in coll)
        {
            ResultPropertyCollection resultPropColl = rs.Properties;
            foreach( Object memberColl in resultPropColl["member"])
            {
                DirectoryEntry gpMemberEntry = new DirectoryEntry("LDAP://" + memberColl);
                System.DirectoryServices.PropertyCollection userProps = gpMemberEntry.Properties;
                object obVal = userProps["sAMAccountName"].Value;
                if (null != obVal)
                {
                    groupMemebers.Add(obVal.ToString());
                }
            }
        }
    }
    catch (Exception ex)
    {
        Console.Write(ex.Message);
    }
    return groupMemebers;
}

Thanks for any help!