JQuery AJAX post to asp.net webmethod never getting called? -

i trying send data javascript aspx webmethod ajax. success option of ajax post fired web method never getting called. javascript code is:

 $.ajax({     type: "post",     url: '../about.aspx/getwfdata',     data: "{senddata: '" + 5 + "'}",     async: true,     success: function (result) {         alert("bravo");     },     error: function (jqxhr, textstatus, errorthrown) {         alert(textstatus);         alert(errorthrown);     } }); 

and webmethod in code behind is:

 [webmethod]     public static string getwfdata(string senddata)     {         return string.format("hello");     } 

try use below code see if works.

var params = '{senddata:' + values + '}';  $.ajax({     type: "post",     url: '../about.aspx/getwfdata',     data: json.stringify(params),     async: true,     success: function (result) {         alert("bravo");     },     error: function (jqxhr, textstatus, errorthrown) {         alert(textstatus);         alert(errorthrown);     } }); 

and refer http://elegantcode.com/2009/02/21/javascript-arrays-via-jquery-ajax-to-an-aspnet-webmethod/ more info. try disable request validation on page.http://www.asp.net/whitepapers/request-validation