Brief Description
Download the complete DirectX SDK, which contains the DirectX Runtime and all DirectX software required to create DirectX compliant applications in C/C++, and C#.
This DirectX SDK release contains updates to tools, utilities, samples, Documentation, and runtime debug files for x64 and x86 platforms. This release also include a public pre-release of Microsoft Cross-Platform Audio Creation tool, Managed Direct Code (2.0 CLR), and Direct3D 10.
Read it @ Micrsoft