Hi to all,
I am new in this forum and I'm trying to resolve this problem:
I have a domain in wich I created 700 user account.
The first problem was to view all users of active directory (this function properly).
The second step is to sort the User Name column.
I tried the same method used when I want to sort the articles in a DB, but  it don't work.
You can help me?
This is the 2 pages I created:
- .aspx - 
- .aspx.cs - 
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.DirectoryServices;
namespace ADSI
{
 /// 
 /// Descrizione di riepilogo per adsi_vista.
 /// 
 public class ElencoUtentiTabella : System.Web.UI.Page
 {
  protected System.Web.UI.WebControls.DataGrid DataGrid2;
  protected System.Web.UI.WebControls.DataGrid DataGrid1;
  protected DirectoryEntry de;
  protected DataSet ds;
  private void Page_Load(object sender, System.EventArgs e)
  {
   DirectorySearcher src = new
DirectorySearcher("(&(objectCategory=Person)(objectClass=user))");
   //DataTable for users
   DataTable tbUsers = new DataTable("users");
   //Create Columns for DataTable.
   tbUsers.Columns.Add("UserName",System.Type.GetType("System.String"));
   ds.Tables.Add(tbUsers);
   //DataTable for properties
   DataTable tbProperties = new DataTable("properties");
   //Create Columns for DataTable.
tbProperties.Columns.Add("PropertyName",System.Type.GetType("System.String")
);
tbProperties.Columns.Add("PropertyValue",System.Type.GetType("System.String"
));
   ds.Tables.Add(tbProperties);
   src.SearchRoot = de;
   src.SearchScope = SearchScope.Subtree;
   foreach(SearchResult res in src.FindAll())
   {
    System.Collections.IDictionaryEnumerator ien =
res.Properties.GetEnumerator();
    DataRow topRow = ds.Tables["users"].NewRow();
    topRow["UserName"] =res.Properties["Name"][0];
    ds.Tables["users"].Rows.Add(topRow);
   }
   DataGrid1.DataSource = ds.Tables["users"];
   DataGrid1.DataBind();
  }
  #region Web Form Designer generated code
  override protected void OnInit(EventArgs e)
  {
   //
   // CODEGEN: This call is required by the ASP.NET Web Form Designer.
   //
   InitializeComponent();
   base.OnInit(e);
  }
  /// 
  /// Required method for Designer support - do not modify
  /// the contents of this method with the code editor.
  /// 
  private void InitializeComponent()
  {
   this.de = new
System.DirectoryServices.DirectoryEntry("LDAP://DOMINIO/CN=Users,DC=DOMINIO,
DC=IT","administrator","prova123");
   this.ds = new System.Data.DataSet();
   ((System.ComponentModel.ISupportInitialize)(this.ds)).BeginInit();
   this.DataGrid1.SelectedIndexChanged += new
System.EventHandler(this.DataGrid1_SelectedIndexChanged);
   //
   // ds
   //
   this.ds.DataSetName = "NewDataSet";
   this.ds.Locale = new System.Globalization.CultureInfo("en-AU");
   this.Load += new System.EventHandler(this.Page_Load);
   ((System.ComponentModel.ISupportInitialize)(this.ds)).EndInit();
  }
  #endregion
...