How to call WebService using AJAX if I created ASP.NET Web Application?

How to 开发者_开发百科call WebService (using AJAX) if I created ASP.NET Web Application template. Every where people are telling how to call web service if you have created a WebSite template in visual studio but not about ASP.NET Web Application template.

Here is a great link that walks through all the steps: Using jQuery to Consume ASP.NET JSON Web Services