Accessing objects in active directory via asp.net

From: Toufani (toufani_at_gmail.com)
Date: 08/31/04 

Date: 31 Aug 2004 05:30:13 -0700

Hi everybody,

I want to retrieve information about objects in active directory
windows 2000 and their properties. I got some codes that don't work
absolutely. for example I can't retrieve users list and group list
separatedly.there is my code that downloaded from the internet :

public class LdapAuthentication
        {
                private string _path;
                private string _filterAttribute;

                public LdapAuthentication(string path)
                {
                        _path = path;
                }

                public bool IsAuthenticated(string domain, string username,
string pwd)
                {
                        String domainAndUsername = domain + @"\" + username;

                        DirectoryEntry entry = new DirectoryEntry( _path,
domainAndUsername, pwd);
                                        
                        try
                        {
                                //Bind to the native AdsObject to force authentication.
                                Object obj = entry.NativeObject;
                
                                 DirectorySearcher search = new DirectorySearcher(entry);
                
                                search.Filter = "(SAMAccountName=" + username + ")";
                                search.PropertiesToLoad.Add("cn");
                                SearchResult result = search.FindOne();
                
                                if(null == result)
                                {
                                        return false;
                                }
                
                                //Update the new path to the user in the directory.
                                _path = result.Path;
                                _filterAttribute = (String)result.Properties["cn"][0];
                        }
                        catch (Exception ex)
                        {
                                throw new Exception("Error authenticating user. " + ex.Message);
                        }
                
                        return true;

                }

                public string GetRoles( )
                {
                        DirectorySearcher search = new DirectorySearcher(_path);
        
                        search.Filter = "(objectClass=group)";
                        search.PropertiesToLoad.Add("member");
                        StringBuilder roleNames = new StringBuilder();
                        try
                        {
                                SearchResult result = search.FindOne();
                                int propertyCount = result.Properties["member"].Count;
                                String dn;
                                int equalsIndex, commaIndex;

                                for( int propertyCounter = 0; propertyCounter <
propertyCount;propertyCounter++)
                                {
                                        dn = (String)result.Properties["member"][propertyCounter];

                                        equalsIndex = dn.IndexOf("=", 1);
                                        commaIndex = dn.IndexOf(",", 1);
                                        if (-1 == equalsIndex)
                                        {
                                                return null;
                                        }
                                        roleNames.Append(dn.Substring((equalsIndex + 1), (commaIndex -
equalsIndex) - 1));

                                        roleNames.Append("|");
                                }
                        }
                        catch(Exception ex)
                        {
                                throw new Exception("Error obtaining group names. <font color=red
>" +
                                        ex.Message+"</font>");
                        }
                        
                        return roleNames.ToString();
                }

                public string GetGroups()
                {
                        DirectorySearcher search = new DirectorySearcher(_path);
                        search.Filter = "(cn=" + _filterAttribute + ")";
                        search.PropertiesToLoad.Add("memberOf");
                        StringBuilder groupNames = new StringBuilder();
                        try
                        {
                                SearchResult result = search.FindOne();
                                int propertyCount = result.Properties["memberOf"].Count;
                                String dn;
                                int equalsIndex, commaIndex;

                                for( int propertyCounter = 0; propertyCounter < propertyCount;
                                        propertyCounter++)
                                {
                                        dn = (String)result.Properties["memberOf"][propertyCounter];

                                        equalsIndex = dn.IndexOf("=", 1);
                                        commaIndex = dn.IndexOf(",", 1);
                                        if (-1 == equalsIndex)
                                        {
                                                return null;
                                        }
                                        groupNames.Append(dn.Substring((equalsIndex + 1),
                                                (commaIndex - equalsIndex) - 1));
                                        groupNames.Append("|");
                                }
                        }
                        catch(Exception ex)
                        {
                                throw new Exception("Error obtaining group names. " +
                                        ex.Message);
                        }
                        return groupNames.ToString();
                }

In fact, I don't know which filter is appropriate for retrieve
information about groups (ofcourse, I got some result by setting my
active directory path ,_path , but it is not thing that i want). I
examine filters above.
please tell me about :

1- search.Filter
2- "objectClass=group"
3- PropertiesToLoad.Add
4- NativeObject
5- and the way to get groups and their members,users and their
properties

So thanks

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