ASP.NET CallBack - AJAX Wrapper Control by ComponentArt

Clean and Elegant: Acts as a universal AJAX container for any ASP.NET content, allowing a whole new class of rich, high-performing web applications.
Superior User Experience: Communicates with the server more effectively and renders user interface elements through callbacks.
Viewstate Maintenance: The latest state of all ASP.NET controls contained on the page can be accesses from the callback event handler.
Bypassing Page Life Cycle: Features the ability to efficiently execute server-side logic without going through the page life cycle.
Client-side Caching: Features the ability to cache all received content on the client ensuring that any given type of content can be loaded only once.
Widest ASP.NET Framework Support: ComponentArt CallBack is available for ASP.NET 1.0, ASP.NET 2.0, ASP.NET AJAX and ASP.NET 3.5.
Cross-Browser Compatibility: Supports IE5-7, Firefox 1-2, Netscape 7-8, Mozillas, Opera 8-9, Safari 1.

The ComponentArt CallBack control was amazingly simple to integrate in myKB.com. We used to do a post back for every article view, recycling the entire page. Now from Grid showing a list of knowledge base articles, a single click fires the CallBack control and loads articles making for a much nicer user experience. Here's the best part: it only took 3 lines of C# code for us to implement.

Scott Cate
myKB.com
Microsoft ASP.NET MVP