New in ASP.NET Ajax 4.0 is the ability to observe javascript data objects to watch for changes to its data properties. Using methods of the new Sys.Observer class like .addPropertyChanged, .setValue, .beginUpdate, .endUpdate and .makeObservable we demonstrate how to watch, or rather, observe for changes. We point out that the MicrosoftAjaxTemplates.js file is where almost all the new functionality is added, allowing you to add these new features to projects using the previous versions of ASP.NET AJAX. Finally, we demonstrate Observable at work with Arrays and the CollectionChanged event.

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About this video:

Duration: 13 Minutes, 12 Seconds
Recorded Using: Visual Studio 2010 Beta 1 or Greater