using System;
using System.Collections.Generic;
using System.Text;
using System.DirectoryServices;namespace ChangeControlApp
{
    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