Accessing Data from webservice through javascript

Question

hi here i attached the coding that from javascript using ajax get a datas from serverside
in that coding have ajaxsample.aspx file

it have 3 button
two button using webservice and one using .ashx file for handle data


the web service return xmldata as a string .

the same data from .ashx file working fine

but from webservice not working

please check and tell to me thanks