c# - Cross-domain ajax calls won't work, even though it works in tutorials -

i'm wokring in asp.net. want create cross domain ajax calls webmethod using cors.

i've come across many examples on internet, including many tutorials ans questions, somehow none works me.

look @ example, it's 1:1 code tutorial found on matter , basic:

// default.aspx.cs [system.web.services.webservicebinding(conformsto = system.web.services.wsiprofiles.basicprofile1_1)] public class myservice : system.web.services.webservice {     [system.web.services.webmethod]     [system.web.script.services.scriptmethod(responseformat = system.web.script.services.responseformat.json, usehttpget = false)]     public string helloworld(string test)     {         string result = "";         result = "success";         return result;     } }  // global.asax httpcontext.current.response.addheader("access-control-allow-origin", "*");  if (httpcontext.current.request.httpmethod == "options") {     httpcontext.current.response.addheader("access-control-allow-methods",     "get, post");     httpcontext.current.response.addheader("access-control-allow-headers",     "content-type, accept");     httpcontext.current.response.addheader("access-control-max-age",     "1728000"); }             

then try run ajax call web browser console (which of course cross-domain call):

$.ajax({     url: "http://localhost:53561/myservice.asmx/helloworld",     type: "post",     contenttype: "application/json; charset=utf-8",     data: '{"test":"asdf"}'     }).done(function (result) {         alert(result.d);     }).fail(function (result) {         alert(result.d); }); 

stil, though should work charm (as said on tutorial page), still xmlhttprequest cannot load http://localhost:53561/myservice.asmx/helloworld. no 'access-control-allow-origin' header present on requested resource. origin 'http://www.google.pl' therefore not allowed access. error in console.

do need antyhing else? should add more code in web.config or global.asax? or can there more security reasons why won't work?