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The .NET Framework is Microsoft's comprehensive and consistent programming model for building applications that have visually stunning user experiences, seamless and secure communication, and the ability to model a range of business processes.

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What's new in .NET Framework 3.5 SP1?

SP1 advances the art of application development
The new ADO.NET Entity Framework feature in SP1 offers developers a model-based paradigm and a rich, standards-based framework for creating data-oriented applications shared across multiple applications and platforms. The separation of presentation, data, and business logic used in concert with a single data model will enable developers to spend less time writing plumbing code and more time refining business logic.

SP1 makes data-driven programming easier
SP1 offers developers support for ASP.NET Dynamic Data, which provides a rich scaffolding framework that enables rapid data-driven development. Since ASP.NET takes care of creating the presentation layer, a fully functional Website is output and ready for customization without the developer writing a single line of code. Further, with ADO.NET Data Services, Web developers can create RESTful Web 2.0-style applications that have better server scalability and improved caching support.

SP1 is the fastest and easiest way to deploy Windows applications
With the .NET Framework Client Profile, a small subset of the Framework that powers client applications, developers can offer their end users a dramatically streamlined and rapid application download experience. In addition, improvements in SP1 result in dramatic reductions in cold start times, allowing developers to serve a broader set of customers with varying hardware profiles.

Discover more new features in .NET Framework 3.5 SP1


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Azure Services Platform community technology preview now available
The Azure Services Platform is a new cloud computing and services platform hosted in Microsoft data centers, providing an operating system and a set of developer services. Download the SDKs, see demos, and get started building applications for the cloud using Visual Studio, ASP.NET, and the .NET Framework.

Riding the Next Platform Wave: .NET Framework 4.0 and Windows Server "Dublin"
Discover how upcoming enhancements in the .NET Framework 4.0 and Windows Server will simplify the deployment, configuration, management, and scalability of composite applications.

Microsoft .NET Framework 3.5 SP1: Now Available for Download
Microsoft .NET Framework 3.5 service pack 1 contains many new features building incrementally upon .NET Framework 2.0 and 3.0. This update also includes cumulative servicing updates for the .NET 2.0 and 3.0 subcomponents.

StockTrader sample application
This application is an end-to-end sample application for .NET Enterprise Application Server technologies that illustrates many of the .NET enterprise development technologies for building highly scalable, rich "enterprise-connected" applications.