Answer - On November 19, 2007, Microsoft officially released the ASP.NET version 3.5 and Visual Studio 2008. Like with the progression from ASP.NET 2.0 to 3.0, the features in ASP.NET 3.5 are additive, meaning that the core assemblies installed from the .NET Framework version 2.0 are still used by the 3.0 and 3.5 versions. The In short, ASP.NET 3.5 doesn't change or take away or break any functionality, concepts, or code present in 2.0 - it simply adds new types and features and capabilities to the framework. Visual Studio 2008 is the recommended tool for developing ASP.NET applications. Unlike previous versions of Visual Studio, which were targeted to a specific framework version (i.e., Visual Studio .NET 2003 targeted ASP.NET 1.1 and Visual Studio 2005 targeted ASP.NET 2.0), Visual Studio 2008 is multi-targeted, meaning that you choose from a drop-down list whether to have Visual Studio 2008 build applications against the ASP.NET 2.0, 3.0, or 3.5 frameworks. Visual Studio 2008 also includes an improved Designer experience, JavaScript debugging and IntelliSense features, and the ability to view and even step into the core .NET Framework code during debugging.  This article provides an overview of the new features in ASP.NET 3.5 and the new web/ASP.NET-related featur