Unmanaged code doesn't execute in /CLR x64 project

Question

With VS2012, I created a CLR Windows Forms Application.  I then added a solution platform for x64 with 'copy settings' from Win32.  I added an unmanaged function called TestFunction.  I'm unable to put a break point in TestFunction and when
I run the code and try to step into (F11) TestFunction, it won't.  The Win32 configuration works fine.  I can step into TestFunction and set a break point.  
I reviewed all of the x64 settings and nothing obvious jumps out.  Any help will be greatly appreciated. 
Chris Warner
// WindowsFormsApplication1.cpp : main project file.
#include "stdafx.h"
#include "Form1.h"
using namespace WindowsFormsApplication1;
#pragma unmanaged
void TestFunction(const char *text)
int total = 2;
for(int i = 0; i < 10; i++)
total *= total;
#pragma managed
[STAThreadAttribute]
int main(array<System::String ^> ^args)
// Enabling Windows XP visual effects before any controls are created
Application::EnableVisualStyles();
Application::SetCompatibleTextRenderingDefault(false);
TestFunction("Hello");
// Create the main window and run it
Application::Run(gcnew Form1());
return 0;

Answer 1

Try this: go to Project Properties, select the x64 platform, go to Configuration Properties node, Debugging, and then change the Debugger Type to “Mixed”.