Is there a way to develop pure ANSI C with Visual Studio 2010?
Via changing the file extension to .c will get you started but here are also some changes to the project file. See here for details: http://support.microsoft.com/kb/829488/en-us
There is also a good podcast on that: http://channel9.msdn.com/Blogs/Sam/C-Language-Programming-with-Visual-Studio-2010-Ultimate-Pro-or-VC-Express