ASP.NET

1. Open Internet Information Service (IIS)
2. Go to "Properties of your Virtual Directiory"
3. Go to "Directory Security" tab
4. Click "Edit" button of "Anonymous access and autherntication control"
5. Uncheck "Anonymous access"

<p><identity impersonate="true"/></p>

<p>System.Directory.Services</p>

try
{
   DirectorySearcher  searcher=new DirectorySearcher();
   string rootDSE=searcher.SearchRoot.Path;

   DirectoryEntry entry = new DirectoryEntry(rootDSE); //eg: Default Domain
   DirectorySearcher dirSearcher = new DirectorySearcher(entry);
   dirSearcher.Filter = "(&(objectClass=user))";
   dirSearcher.SearchScope=SearchScope.Subtree;
   dirSearcher.Sort.Direction=System.DirectoryServices.SortDirection.Ascending;
   dirSearcher.Sort.PropertyName="cn";

   ArrayList domainMembers = new ArrayList();

   //Finding all users.
   foreach(SearchResult result in dirSearcher.FindAll())
   {			
     try
     {
	string strUserInfo = string.Empty;
        DirectoryEntry de=result.GetDirectoryEntry();
	

	if(de.Properties.Contains("sAMAccountName"))
	  strUserInfo = de.Properties["sAMAccountName"].Value.ToString();
        
        domainMembers.Add(strUserInfo);	
     }
     catch(Exception ex)
     {
	Console.WriteLine(ex.Message);				
     }
   }
     DataGrid1.DataSource = domainMembers;
     DataGrid1.DataBind();
}
catch(Exception ex)
{
   Console.WriteLine(ex.Message);				
}

1. An operations error occurred
2. The specified domain either does not exist or could not be contacted

Thanks and Regards,
Michael Sync ( Blog: http://michaelsync.net)

If you want to thank me for my help, please vote my message by clicking one of numbers beside "Rate this message". Thank you.