how to open 'Select Users Or Groups' window using c#

http://www.dslreports.com/forum/r19840843-C-Show-the-Select-Users-or-Groups-dialog
http://www.codeproject.com/KB/winsdk/bfobjectselection2.aspx

I've already found both links and downloaded the sources from codeproject, but I'm unable to figure out how to use it.

I've copy the code from the codeproject page, added a reference to the helper dll but having problem with
'ADFlagConstants'.

Can you please help in completing the code to open the dialog box?

Thanks.

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;
 
namespace MySelectUsersAndGroups
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            // grab the helper object
 
            ObjectPickerHelper.CADObjectPicker picker =
               new ObjectPickerHelper.CADObjectPickerClass();
            // mess with the flags
 
            picker.ScopeFlags =
             (uint)(ADFlagConstants.DSOP_SCOPE_FLAG.WANT_PROVIDER_WINNT);
            picker.ScopeTypeFlags =
             (uint)(ADFlagConstants.DSOP_SCOPE_TYPE.DOWNLEVEL_JOINED_DOMAIN |
                  ADFlagConstants.DSOP_SCOPE_TYPE.ENTERPRISE_DOMAIN |
                  ADFlagConstants.DSOP_SCOPE_TYPE.EXTERNAL_DOWNLEVEL_DOMAIN |
                  ADFlagConstants.DSOP_SCOPE_TYPE.EXTERNAL_UPLEVEL_DOMAIN |
                  ADFlagConstants.DSOP_SCOPE_TYPE.UPLEVEL_JOINED_DOMAIN |
                  ADFlagConstants.DSOP_SCOPE_TYPE.USER_ENTERED_DOWNLEVEL_SCOPE |
                  ADFlagConstants.DSOP_SCOPE_TYPE.USER_ENTERED_UPLEVEL_SCOPE |
                  ADFlagConstants.DSOP_SCOPE_TYPE.GLOBAL_CATALOG);
            picker.UplevelFilterFlags_Both =
             (uint)ADFlagConstants.DSOP_FILTER.COMPUTERS;
            picker.UplevelFilterFlags_Mixed = 0;
            picker.UplevelFilterFlags_Native = 0;
            picker.DownLevelFilterFlags =
             ADFlagConstants.DSOP_DOWNLEVEL_FILTER_COMPUTERS;
            picker.InitInfo_OptionFlags = (uint)ADFlagConstants.DSOP_FLAG.MULTISELECT;
 
 
            // show the dialog
 
            picker.InvokeDialog(UsersOrGroupsFrm.ActiveForm.Handle.ToInt32());
 
            // somehow C# seems more picky with the types than VB, 
 
            // so you have to use an intermediate var.
 
            ObjectPickerHelper.CADObjectColl coll =
             (ObjectPickerHelper.CADObjectColl)picker.ADObjectsColl;
 
            // and walk the collection
 
            int i = 0;
 
            foreach (ObjectPickerHelper.CADObjectInfo InfoObject in coll)
            {
                ListViewItem theItem = new ListViewItem(InfoObject.Name, i);
                theItem.SubItems.Add(InfoObject.Class);
                theItem.SubItems.Add(InfoObject.ADPath);
                theItem.SubItems.Add(InfoObject.UPN);
                listViewResults.Items.Add(theItem);
                i++;
            }
 
        }
    }
}

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did you read the section Using the code in the code project site?

yes I did.

As I said, I've copy the code from the codeproject page, added a reference to the helper dll but having problem with
'ADFlagConstants'.

You can see it in the attached code in my previous replay.

Thanks.