查询Active Directory中某个OU下的所有用户，并将用户名输出到列表框中

我需要修改我们添加到模式中的自定义属性，但是以所有用户为基础。该属性是MD5散列，我已经将其存储为公共变量。我试图获得指定OU内所有用户的列表，以便在列表框中列出，以便您可以选择所有用户或个人用户，以便将值应用于。

这是我的当前代码Form1.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Security.Cryptography;
using System.DirectoryServices;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        String Password;
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
        }
        private void textBox1_TextChanged(object sender, EventArgs e)
        {
            Password = textBox1.Text;
        }
        private void button1_Click(object sender, EventArgs e)
        {
            System.Security.Cryptography.MD5CryptoServiceProvider x = new System.Security.Cryptography.MD5CryptoServiceProvider();
            byte[] bs = System.Text.Encoding.UTF8.GetBytes(Password);
            bs = x.ComputeHash(bs);
            System.Text.StringBuilder s = new System.Text.StringBuilder();
            foreach (byte b in bs)
            {
                s.Append(b.ToString("x2").ToLower());
            }
            Password = s.ToString();
            textBox2.Text = Password;

        }   
        private void button2_Click(object sender, EventArgs e)
        {
        }
        private void textBox2_TextChanged(object sender, EventArgs e)
        {
        }
        private void button3_Click(object sender, EventArgs e)
        {
        }
        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
        }
    }
}

// List of strings for your names
List<string> allUsers = new List<string>();
// create your domain context and define the OU container to search in
PrincipalContext ctx = new PrincipalContext(ContextType.Domain, "DOMAINNAME", 
                                            "OU=SomeOU,dc=YourCompany,dc=com");
// define a "query-by-example" principal - here, we search for a UserPrincipal (user)
UserPrincipal qbeUser = new UserPrincipal(ctx);
// create your principal searcher passing in the QBE principal    
PrincipalSearcher srch = new PrincipalSearcher(qbeUser);
// find all matches
foreach(var found in srch.FindAll())
{
    // do whatever here - "found" is of type "Principal" - it could be user, group, computer.....          
   allUsers.Add(found.DisplayName);
}