How to know if native method is safe / unsafe?

Question

I implement this function : GetSystemPowerStatusEx & GetSystemPowerStatusEx2

according to this article on MSDN, I should create a class named according to the fu

Answer 1

It's a pretty silly warning and ultimately unproductive. But keeping it happy is simple, just add a static class to your project named NativeMethods and put the [DllImport] declarations inside it. No need for separate classes. Declare them internal.

Beware that you cannot call these functions on an emulator, testing them is going to require running it on the device itself. To keep your program debuggable in the emulator be sure to wrap the code that calls them with #ifdef DEBUG.