The ASP.NET AJAX Update Panel is a popular choice for creating dynamic data grids in ASP.NET applications. However, it is only a minor part of ASP.NET AJAX and is used mainly to enable AJAX responsiveness in server-side controls. One drawback to the Update Panel is that it promotes a tightly coupled architecture in which the control is bound to a server-side data source that is not directly exposed to the client. With a pure AJAX architecture, the data sources are exposed to the client in the form of XML, JSON, or text data streams that can be consumed by multiple controls. AJAX pushes the presentation all the way down to the client and promotes server-side architectures based on services rather than controls. In the long run, the pure AJAX architecture is more flexible because it promotes reuse while exposing data sources to remote applications.
To dubug AJAX, there are tools available in download:
Script debugging tools used directly in the browser are essential for effective AJAX development. Essential debugging tools include Nikhil Kothari’s Web Development Helper for Microsoft Internet Explorer 7.0, available from http://projects.nikhilk.net/Projects/WebDevHelper.aspx and FireBug for Mozilla Firefox 2.0, available from http://www.getfirebug.com.