how to call a cross domain asmx web service in ajax . how to allow a web service to be callable from other domain in ajax

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jQuery

ASMX

webservice

hello friends... i am trying from so many days to call a web service from javascript... which is available on another domain... means cross domain web service . and i am failing again and again , can anyone tell me how to do it in productive way.

1: the service is like this ..

[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line.
[System.Web.Script.Services.ScriptService]
public class camp : System.Web.Services.WebService {

public camp () {

//Uncomment the following line if using designed components
//InitializeComponent();
}

[WebMethod, ScriptMethod(ResponseFormat = ResponseFormat.Json, UseHttpGet = true)]
public string HelloWorld() {
return "Hello World... its cross domain";
}

}




2: and script function is like this ....


<script type="text/javascript">


$(document).ready(function () {

var surl = "http://localhost:1061/camp_web_service/camp.asmx/HelloWorldcallback=hello";
$.ajax({
type: 'GET',
url: surl,
crossDomain: true,
contentType: "application/json; charset=utf-8",

dataType: "jsonp",
success: function (msg) {
$.each(msg, function (name, value) {
alert(value);
});
},
error: function (xhr, status, error) { alert('Servidor de error 404 !!'); },
async: true,
cache: false
});
});
</script>