Web services through JQuery

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jQuery

webservice

Hi Friends,
I am using the following jquery to call my web service.

$(document).ready(function () {
           SearchText();
       });
       function SearchText() {
           $(".csSearch").autocomplete({
               source: function (request, response) {
                   $.ajax({
                       type: "POST",
                       contentType: "application/json; charset=utf-8",
                       url: "WebService.asmx/GetCountries",
                       data: "{'prefixText':'" + $('.csSearch')[0].value + "','Flag':'" + $('.cslbl')[0].innerHTML + "','val':'" + $('.csdrpsrc')[0].value + "'}",
                       dataType: "json",
                       success: function (data) {
                           response(data.d);
                       },
                       error: function (result) {
                           alert("Error....." + $('.csSearch')[0].value);
                       }
                   });
               }
           });
       }

In case it happens to be working fine in my one web form but dosen't work in another web form of same application. It dosen't gives me error but does not even invoke my web service method.
In both the form I have used same web service and same method.

Thanks in advance.