Microsoft has released Microsoft Windows Software Development Kit (SDK) for Windows Server 2008 and .NET Framework 3.5
>> Windows SDK for Windows Server 2008 and .NET Framework version 3.5
The Windows SDK provides prerelease documentation, samples, header files, libraries, and tools designed to help you develop Windows applications using both native (Win32) and managed (.NET Framework) technologies.
>> Windows SDK for Windows Server 2008 and .NET Framework version 3.5