Using AJAX with ASP.NET - Calling ASP.NET Web Service (Part 4)

(Bipin Joshi) In Part 2 we discussed how to work with DataSet returned by the web form. The disadvantage of using web forms as data suppliers is that one web form typically returns only one DataSet. You need to put all the code in the Page_Load. It would be much more organized and useful if you can call Web Service using AJAX. You can then neatly organize your code in various web methods and call the required one from the JavaScript code. In this article I will illustrate how web services can be called from client side JavaScript using HTTP POST method.