TypeLoadException in code using common controls
If you're mixing unmanaged and managed code in your MC++ applications, and the unmanaged code uses the common controls (either directly or through MFC), you might run into unexpected System::TypeLoadException exceptions at runtime, similar to this:

An unhandled exception of type 'System.TypeLoadException' occurred in 
X.exe

Additional information: Could not load type _TREEITEM from assembly
X....

You might find this error with other types, too, such as _IMAGELIST.

The reason for this is because these types are not defined in the windows headers, but only forward declarations are provided, which cause the MC++ compiler not to generate metadata for them.

There is one easy workaround for this, and that is to provide empty definitions of them in one of your .CPP files in the project, like this:

struct _IMAGELIST { };
struct _TREEITEM { };