how can i get an array from nu soap

[jhuaraya]

hi all people, i am an infromatic student and i am starting to learn about webservices. i have a trouble with c# and nusoap. so Ihave this php webservice

<?
// comienzo del script
require_once('lib/nusoap.php');
$servidor = new soap_server();
$servidor->configureWSDL("Articuloswsdl","urn:Articuloswsdl");
$servidor->register("usuarios",
array('val' => 'xsd:string' ), // no pasa parámetros
array("return" => "xsd:string"), // pero si recibe una respuesta en formato 'string'
"urn:Articuloswsdl",
"urn:Articuloswsdl#Posts",
"rpc",
"encoded",
"Toma el nombre o titulo de los articulos publicados en sindicados.com"
);
function usuarios($val){
$link = mysql_connect("localhost","root","213141");
mysql_select_db("ws");
$consulta = "select *from  usuarios";
$query = mysql_query($consulta,$link);
//creamos un array
$datos1 = array();

$filas = mysql_affected_rows($link);
for($i=0;$i<$filas;$i++)
{
array_push($datos1,(mysql_result($query,$i,"Nick")),mysql_result($query,$i,"Pass"));
}
return $datos1;
}
$HTTP_RAW_POST_DATA = isset($HTTP_RAW_POST_DATA) ? $HTTP_RAW_POST_DATA : '';
$servidor->service($HTTP_RAW_POST_DATA); 
/*--

but i can't get the array in c#. this trouble is driving me crazy so i nedd help please thanks