So I have seen many examples such as these : https://stackoverflow.com/a/8094230/2525507
public class WebService : System.Web.Services.WebService {
[WebMetho
If your method takes no arguments, just don't specify the data property on the ajax call
Also I could be wrong, but the WebService method you showed, doesn't look like it will return json. I think you will have to serialize, or set the content type or something similar. (Been along time since I've used the asmx type services)