Solvedwhat i do?

1>------ Build started: Project: ChoraNUB, Configuration: Debug Win32 ------
1> stdafx.cpp
1>c:\users\....\documents\visual studio 2010\projects\choranub\choranub\stdafx.h(9): fatal error C1083: Cannot open include file: 'd3dx9.h': No such file or directory
1> dllmain.cpp
1>c:\users\.....\documents\visual studio 2010\projects\choranub\choranub\stdafx.h(9): fatal error C1083: Cannot open include file: 'd3dx9.h': No such file or directory
1> Hack.cpp
1>c:\users\.....\documents\visual studio 2010\projects\choranub\choranub\stdafx.h(9): fatal error C1083: Cannot open include file: 'd3dx9.h': No such file or directory
1> Generating Code...
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

?? is a error in the directx SDK? what i do? please answer my question