I search the directx sdk on internet and find various versions .
The more up to date i have found is the DXSDK_Jun10.exe wich numeric signature is:
mercredi 2 juin 2010 14:33:48 version 9.29.1962.0
2010 seem a little old ,is there a more up to date version ?.
In the directx,there is many C++ samples very useful.