CLASS : VALIDER UN LOGIN ET MOT DE PASSE SUR ACTIVE DIRECTORY (ASP.NET, C#)

using System;
using System.Collections;
using System.DirectoryServices;

namespace FormsAuthAD
{
	/// <summary>
	/// Description résumée de ActiveDirectory.
	/// </summary>
	public class LdapAuthentication
	{
		public LdapAuthentication()
		{
			//
			// TODO : ajoutez ici la logique du constructeur
			//
		}

		public LdapAuthentication( string path )
		{
			_path = path;
		}

		private string _path;
		private string _filterAttribute;

		public bool IsAuthenticated(string domain, string username, string pwd)
		{
			string domainAndUsername = domain + @"\" + username;
			DirectoryEntry entry = new DirectoryEntry( _path, 
				domainAndUsername,
				pwd);

			try
			{ 
				// Bind to the native AdsObject to force authentication.
				Object obj = entry.NativeObject;
				DirectorySearcher search = new DirectorySearcher(entry);
				search.Filter = "(SAMAccountName=" + username + ")";
				search.PropertiesToLoad.Add("cn");
				SearchResult result = search.FindOne();
				if(null == result)
				{
					return false;
				}
				// Update the new path to the user in the directory
				_path = result.Path;
				_filterAttribute = (String)result.Properties["cn"][0];
			}
			catch (Exception ex)
			{
				throw new Exception("Error authenticating user. " + ex.Message);
			}
			return true;
		}

		
	}
}


// UTILISATION DE LA CLASS EXEMPLE :
bool bResult = false;
LdapAuthentication MyAD = new LdapAuthentication( "LDAP://AdresseOuNomduserveurdedomaine" );

try
{
       bResult = MyAD.IsAuthenticated( "Nomdudoaine","login", "Motdepasse" );		
}
catch( Exception ExErreur )
{
     messageLabel.Text = "Erreur Active Directory : "+ExErreur.Message;
}