สอบถามเรื่องการเชื่อมต่อกับ AD ต่อจากกระทู้นี้ครับ

namespace ADUserInfo
{

    public partial class GetInfo : System.Web.UI.Page
    {
	
        string initLDAPPath = "dc=tc, dc=thaicreate";
        string initLDAPServer = "192.168.1.1";
        string initShortDomainName = "thaicreate";

        string user = "test"; // Ad User
        string pass = "test"; // Password


        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void btnLogin_Click(object sender, EventArgs e)
        {

            string strCommu;
            strCommu = ("LDAP://" + (initLDAPServer + ("/" + initLDAPPath)));

            DirectoryEntry entry = new DirectoryEntry(strCommu);
            entry.Username = initShortDomainName + "\\" + user;
            entry.Password = pass;

            object obj;
            try
            {
                obj = entry.NativeObject;
                DirectorySearcher search = new DirectorySearcher(entry);
                SearchResult result;
                search.Filter = ("(SAMAccountName="
                            + (txtUser.Text + ")"));
                search.PropertiesToLoad.Add("cn");
                search.PropertiesToLoad.Add("displayName");
                search.PropertiesToLoad.Add("mail");

                result = search.FindOne();
                if ((result == null))
                {
                    this.lbDisplay.Text = "NOT FOUND DATA!";
                }
                else
                {

                    foreach (SearchResult searchResults in search.FindAll())
                    {


                            List<Employee> eList = new List<Employee>();
                            Employee emp = new Employee();
                            emp.USER = txtUser.Text;
                            emp.MAIL = searchResults.Properties["mail"][0].ToString();
                            emp.HESTAT = dt.Rows[0]["HESTAT"].ToString();
                            emp.HEMPCD = dt.Rows[0]["HEMPCD"].ToString();
                            emp.HANAMT = dt.Rows[0]["HANAMT"].ToString();
                            emp.HANAME = dt.Rows[0]["HANAME"].ToString();
                            emp.HEPATL = dt.Rows[0]["HEPATL"].ToString();
                            emp.ACONF = dt.Rows[0]["ACONF"].ToString();
                            emp.AJOIND = dt.Rows[0]["AJOIND"].ToString();
                            emp.HDIV = dt.Rows[0]["HDIV"].ToString();
                            emp.HDEP = dt.Rows[0]["HDEP"].ToString();
                            emp.HDSG = dt.Rows[0]["HDSG"].ToString();
                            emp.HPDV = dt.Rows[0]["HPDV"].ToString();
                            emp.DATE = DateTime.Now.ToString();

                            eList.Add(emp);

                            MemoryStream stream1 = new MemoryStream();
                            DataContractJsonSerializer ser = new DataContractJsonSerializer(eList.GetType());
                            ser.WriteObject(stream1, eList);

                            stream1.Position = 0;

                            StreamReader sr = new StreamReader(stream1);
                            this.lbDisplay.Text = sr.ReadToEnd();
                            //as above
                    }


                }
            }
            catch (Exception ex)
            {
                this.lbDisplay.Text = "Please check user/password" + ex.Message;
            }


        }

    }

    public class Employee
    {
        public string USER { get; set; }
        public string MAIL { get; set; }
        public string HESTAT { get; set; }
        public string HEMPCD { get; set; }
        public string HANAMT { get; set; }
        public string HANAME { get; set; }
        public string HEPATL { get; set; }
        public string ACONF { get; set; }
        public string AJOIND { get; set; }
        public string HDIV { get; set; }
        public string HDEP { get; set; }
        public string HDSG { get; set; }
        public string HPDV { get; set; }
        public string DATE { get; set; }
    }
}