I'm trying to get json data from a web service. using ASP.NET Ajax

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C#

VB

ASP.NET

web

web_development

Web Service code... Service.asmx

[WebMethod]
   public string HelloWorld() {
       string log = "Hello World";
       JavaScriptSerializer jss = new JavaScriptSerializer();
       string json = jss.Serialize(log);
       return json;
   }

where I want to get web service data... through ajax.

<script type="text/javascript" src="

http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>

<script type="text/javascript">
     $(document).ready(function(){

            $.ajax({
                type: "POST",
                url: "Service.asmx/HelloWorld",
                data: "{}",
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: function(msg) {
                    alert(msg.d);
                },
                error: function(e) {
                    alert("WebSerivce unreachable");
                }
            });
        });
    </script>

but I am getting error get web service data.