WPF/C# Active Directory Display Name for user input

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C#

WPF

active-directory

Hello everyone... I have a Windows Authentication screen (WinLogin.xaml) and it uses an ADHelper.cs the validate an account. That works just great, but for some reason, I cannot get the the system to pass the authenticated user's DISPLAY NAME back to the previous screen.

Basically...

WinLogin.xaml - enter username, password and press Login -- if OK, go to form1 else msgbox.
Form1.xaml - enter username's DISPLAY NAME from Winlogin.xaml to TBoxPharmSign.Text;

ADHelper.cs

using System.DirectoryServices;

namespace BizLogic
{
    public class AdHelper
    {
        #region AuthenticateUser Method

        public bool AuthenticateUser(string domainName, string userName, string password)
        {
            var ret = false;
            try
            {
           var de = new DirectoryEntry("LDAP://" + domainName, userName, password);
           var dsearch = new DirectorySearcher(de);
               dsearch.FindOne();
                ret = true;
            }
            catch
            {
                ret = false;
            }
            return ret;
        }
        #endregion
    }
}

WinLogin.cs

using System.Windows;
using BizLogic;

namespace Forms
{
    public partial class WinLogin
    {

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            TxtDomain.Text = Environment.UserDomainName.ToLower();
        }

        private void WinLoginLogin_Click(object sender, RoutedEventArgs e)
        {
            var ad = new AdHelper();

            if (ad.AuthenticateUser(TxtDomain.Text,
                TxtUserName.Text, TxtPassword.Password))
            {
                    DialogResult = true;
            }
            else
                MessageBox.Show("Unable to Authenticate Using the Supplied Credentials");
        }
    }
}

Finally, the click action where the help is needed on Form1.xaml

private void eSign_Click(object sender, RoutedEventArgs e)
{
    //added for winlogin instance
    var win = new WinLogin {Owner = this};

    win.ShowDialog();
    if (!win.DialogResult.HasValue || !win.DialogResult.Value)
    {
        Close();
    }
    else
    {


        TBoxPharmSign.Text = "AD Display Name From WinLogin.xaml - "
    }

    Log.Info("Cor551240415V1.EmployeeSearch_Click() called into existence for employee:");
}