title: Adding existing .h and .c files to a Microsoft Visual Studio 2010 C++ project
body: <p>I would like to use some pre-written .h and .c files in my MSVS2010 C++ project.
  These are source files of a library that I would like to use in my project.
  I went and added .h files to "Header Files" folder in my MSVS solution, and .c files to "Source Files" folder.
  But when I include one of the .h files using include "sample.h", it does not recognize that header file.
  What do I need to do so that MSVS recognize the added files?
  Thanks for the help.</p>