VC++ Undeclared identifier error with multiple forms

I'm trying to work with Visual C++ .net using Windows Form Application and when I try to make a secondary form and declare variables of type HANDLE or DWORD I keep getting an "Undeclared Identifier" error. I don't get this same error in the main form. I also put the include for the header of the second form after all the other includes. No matter where I put it, I still get that error. I'm a little confused as to why this is happening. Would anyone be able to help me out?

 

Nevermind. I fixed it by putting #include <windows.h> at the beginning of the header file for the second form. Somehow I think the second form header is being included before anything else. Oh well. Sorry for the stupid question