I have gone though article
http://www.aspsnippets.com/Articles/Send-and-Receive-JSON-objects-to-Web-Service-Methods-using-jQuery-AJAX-in-ASPNet.aspx
Sending and receiving json data.
There i have noticed you are debuging webmethod to get the properties of city object.
In my application i am making a ajax call to a webmethod and getting a error, in firebug it shows internal server error . I believe there must be some bug in my webmethod. But i dont know how to debug it setting break point in my code didn't help as it overlooks the break point.
Kindly Help me!!