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jQuery(document).ready(function(){
                $.ajax({
                    type : "GET",
                    url : "http://service.test.com/t1.ashx?callback=?",
                    dataType : "jsonp",
                   jsonp: "callback",
                    success : function(json){
                        $('#feeds').html(json.msg);
                        return true;
                    }
                });
            });
 <div id="feeds">   </div>
t1.ashx
public void ProcessRequest(HttpContext context)
         {
             context.Response.ContentType = "text/htm