How to get response from ajax method with jsonp?

How to get response from ajax method with jsonp?

Hi dears,

I'm using this code to call ASP.net web service on remote server:
  2. $.ajax({
  3.     type: "GET",
  4.     url: 'http://url',
  5.     data: "parameter=hello",
  6.     dataType: "jsonp",
  7.     contentType: "text/xml",
  8.     success: function (data, textStatus, jqXHR) {
  9.         alert(data.length);
  10.     },
  11.     complete: function (jqXHR, textStatus) {
  12.         alert('complete');
  13.     },
  14.     error: function (jqXHR, textStatus, errorThrow) {
  15.         alert('error function');
  16.     }
  17. });
But no alert and I got error:
  1. SyntaxError: syntax error 
    <?xml version="1.0" encoding="utf-8"?>
And the response from FireBug is: 
  1. <?xml version="1.0" encoding="utf-8"?> <string xmlns="http://tempuri.org/">Hello Aidy</string>
Appreciate your feedback.

Thank you.