Message from webpage undefined - asp.net

Question

I am returning a simple string from a webmethod to a Javascript function.
I am using an AJAX enabled website in ASP.NET 2.0. I get the date in firefox but inside IE 8 it returns undefined.
Do I have to parse the string in the JSON format using some serialize class? In my webmethod, I am just using:
return DateTime.Now.ToString();
$(document).ready(function(){
var pageUrl = '<%=ResolveUrl("~/test/test.aspx")%>';
// Test
$('#<%=trgNo.ClientID%>').change(function(){
var trgId = $(this+'input:checked').val();
$.ajax({
type: "POST",
url : pageUrl+ '/getDet',
data : '{categ: "' +trgId + '"}',
contentType:"application/json; charset=utf-8",
dataType:"json",
success:OnSuccess,
failure: function(msg){
if(msg.hasOwnProperty("d"))
alert(msg.d);
else
alert('error fetching values from database');
}
});
});
function OnSuccess(msg)
{
if(msg.hasOwnProperty("d"))
alert(msg.d);
else
alert(msg);
}
});
Edit
It seems the success function is firing the problem is with response 'alert(msg)' works in firefox but not in IE 8 with asp.net 2.0

Answer 1

Maybe you dont want to use this, but I´m very happy with the asp net ajax build in function, since it builds a header, that works properly on browsers.
$(document).ready(function(){
var pageUrl = '<%=ResolveUrl("~/test/test.aspx")%>';
// Test
$('#<%=trgNo.ClientID%>').change(function(){
var trgId = $(this+'input:checked').val();
var proxy = Sys.Net.WebServiceProxy;
proxy.invoke("", // if current page "", if webservice "/srv.asmx"
"getDet", //method name
false, //post = true, get = false
{ categ : trgId }, //javascript object
OnSuccess, // Success Function
onError, // Error Function
{ yourOwn : userData } // Custom User Data to Handler
);
});
function OnSuccess(response, usercontext)
{
// usercontext.yourOwn === userData;
// response is sent WITHOUT "d", it is removed internally by the proxy
alert(response);
}
});
Dont forget to include the ScriptManager...