public static string[] GetServers()
 {
     var directoryServiceClientRef = new DirectoryServiceClient();
     //directoryServiceClientRef.ClientCredentials.Windows.ClientCredential.UserName = "******";
     //directoryServiceClientRef.ClientCredentials.Windows.ClientCredential.Password = "******";
     //directoryServiceClientRef.ClientCredentials.Windows.ClientCredential.Domain = "ADIR";
     return directoryServiceClientRef.GetServers();
 }