'base class' : managed classes only support public inheritance
An attempt was made to use a managed class as a private or protected base class. A managed class can only be used as a base class with public access.
The following sample generates C3628:
#using <mscorlib.dll> __gc class B { }; __gc class D : B { // C3628, private is the default access level // The following line resolves the error. // __gc class D : public B { }; void main() { }