What is .NET 4?
.NET 4 is 100-percent backwards compatible with the current version of ASP.NET and will provide a smooth migration experience when it is released. Backwards compatibility surely means that all ASP.NET 1.x and ASP.NET 2.0 code you may have will work as expected in ASP.NET 3.5. However, a simple version switch doesn't guarantee that you will make the most out of the ASP.NET 3.5 framework. Taking advantage of the new features of ASP.NET 3.5 ensures more compact code, a richer set of services and capabilities, a more effective and appealing user interface, a more elegant and easy-to-maintain application architecture, and a powerful set of administration tools.
 
Overview
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Visual Studio 2010 and the .NET Framework 4.0 mark the next generation of developer tools from Microsoft. Designed to address the latest needs of developers, Visual Studio delivers key innovations in the following pillars:
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- Democratizing Application Lifecycle Management - Application Lifecycle Management (ALM) crosses many roles within an organization and traditionally not every one of the roles has been an equal player in the process. Visual Studio Team System 2010 continues to build the platform for functional equality and shared commitment across an organization’s ALM process.
- Enabling emerging trends - Every year the industry develops new technologies and new trends. With Visual Studio 2010 and .NET Framework 4.0, Microsoft delivers tooling and framework support for the latest innovations in application architecture, development and deployment.
- Inspiring developer delight - Ever since the first release of Visual Studio, Microsoft has set the bar for developer productivity and flexibility. Visual Studio 2010 continues to deliver on the core developer experience by significantly improving upon it for roles involved with the software development process. .NET Framework 4.0 contains numerous improvements that make it easier to develop powerful and compelling applications.
- Riding the next generation platform wave - Microsoft continues to invest in the market leading operating system, productivity application and server platforms to deliver increased customer value in these offerings. With Visual Studio 2010 and .NET Framework 4.0 customers will have the tooling support and the platform support needed to create amazing solutions around these technologies.
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For more information on Visual Studio 2010 and the .NET Framework 4.0 visit http://msdn.microsoft.com/en-us/vs2008/products/cc948977.aspx
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This CTP release is available in English only as a Virtual PC image. To download Virtual PC 2007 please visit http://www.microsoft.com/downloads/details.aspx?FamilyId=28C97D22-6EB8-4A09-A7F7-F6C7A1F000B5&displaylang=en
The CTP is designed to enable users to experience Visual Studio 2010 and the .NET Framework 4.0, and to provide feature design feedback on a limited set of features. These features are exposed through a set of walkthroughs that are included in the VPC itself. Many common development scenarios may not work in this CTP as it is designed to support the above walkthroughs.
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