I have following code that validates a given user credentails against a
active directory. The login part works but I can not search fails to return
the record. Does any one have any idea what is wrong?

       public void Login(string user, string pwd, string domain)
       {
           string path = "<<my ldap path>>";

           DirectoryEntry domainEntry = new DirectoryEntry(path);
           domainEntry.Username = domain + @"\" + user;
           domainEntry.Password = pwd;

           domainEntry.AuthenticationType = AuthenticationTypes.Secure;

           string searchFilter = "sAMAccountName=" + user;

           DirectorySearcher searcher = new DirectorySearcher(domainEntry,
searchFilter);

           searcher.SearchScope = SearchScope.Subtree;

           //The following line throws exception if supplied user
credentails are not valid
           SearchResult result = searcher.FindOne();
           Console.WriteLine("Login succeeded.");

           if (result == null)
           {
               Console.WriteLine("Search for user failed.");
               Console.WriteLine();
           }
           else
           {
               Console.WriteLine("Search for user succeeded.");
           }
       }

Thanks.
Raghu/..