.NET Framework 3.5 builds incrementally on the new features that were added in .NET Framework 3.0. In addition, .NET Framework 3.5 contains some new features which have been added as new assemblies to avoid breaking changes. They include the following:
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ASP.NET AJAX 3.5 lets you create more efficient, more interactive, and more personalized Web user experiences that work across most browsers.
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New classes in .NET Framework 3.5 base class library address many common customer requests.
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