我要能否获得ldap的密码


public SearchResultCollection SearchLDAPUser(string _username, string _password)
    {
        try
        {
            //DirectoryEntry entry = new DirectoryEntry(this.path, _username, _password, AuthenticationTypes.Secure);
            DirectoryEntry entry = new DirectoryEntry("XXXXXXXXXXXXXXX", "XXXXXXXXXXXXX", "XXXXXXXXXXXXXXXXXXX", AuthenticationTypes.Secure);            DirectorySearcher searcher = new DirectorySearcher(entry);            searcher.Filter = "(objectClass=User)";
            searcher.SearchScope = SearchScope.Subtree;
            searcher.PropertiesToLoad.Add(this.LDAP_PROP_COMMON_NAME);
            searcher.PropertiesToLoad.Add(this.LDAP_PROP_DISPLAY_NAME);
            searcher.PropertiesToLoad.Add(this.LDAP_PROP_EMAIL_NAME);
            searcher.PropertiesToLoad.Add("objectClass");
            searcher.PropertiesToLoad.Add("UserPassword");
            searcher.PropertiesToLoad.Add(this.LDAP_PROP_LASTNAME);
            searcher.PropertiesToLoad.Add(this.LDAP_PROP_FIRSTNAME);
            searcher.PropertiesToLoad.Add(this.LDAP_PROP_ADDRESS);
            searcher.PropertiesToLoad.Add(this.LDAP_PROP_PROVINCE);
            searcher.PropertiesToLoad.Add(this.LDAP_PROP_COUNTRY);
            searcher.PropertiesToLoad.Add(this.LDAP_PROP_PHONE);
            searcher.CacheResults = (true);
            searcher.ReferralChasing = ReferralChasingOption.All;
            SearchResultCollection result = searcher.FindAll();
            searcher.Dispose();
            return result;
        }
        catch (Exception E)
        {
            this.Response.Write(E.ToString());
            return null;
        }
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        SearchResultCollection sr = SearchLDAPUser(this.TextBox1.Text, "");
        if (sr.Count>0)
        {
            this.Response.Write("GOOD!<br/>");
            this.Response.Write(sr.Count.ToString());
            int i = 0;
  
            string str = "";
            foreach (SearchResult sr1 in sr)
            {
                         TODO(sr1);
            }
            this.Response.Write(str);
        }
        else
        {
            this.Response.Write("null");
        }    }
    void TODO(SearchResult sr)
    {
        string str = "";
        System.DirectoryServices.ResultPropertyCollection props = sr.Properties;       
        foreach (string name in props.PropertyNames)
        {
            foreach (object o in props[name])
            {
                str += name.ToString() + ":" + o.ToString() + "<br/>";
            }
        }
        this.Response.Write(str);
        this.Response.Write("<hr/><br/>");
    }
里面的密码是AD管理员的密码
有办法没有？？？