First preview of ASP.NET AJAX 4.0 has been released today.

List of new feature:

  • Client-side template rendering
  • Declarative instantiation of behaviors and controls
  • DataView control
  • Markup extensions
  • Bindings

I’m personally most excited with Client-side templates approach that was first time introduced by Nikhil Kothari at the MIX earlier this year. This client-side templating framework allows you in simple manner separate HTML markup blocks which contains templates from JavaScript code that generates page content on callbacks, Web-service method’s call, JSON requests etc. So the other good thing is that designer can see and change view and styling of this blocks in design-time without JS “decoding”.