'interface member' : containing class does not implement interface 'interface'
You attempted to implement an interface member in a class that does not derive from the interface. You should either delete the implementation of the interface member or add the interface to the base-class list of the class.
The following sample generates CS0540:
namespace x { interface I { void m(); } public class clx { void I.m() // CS0540 { } public static int Main() { return 0; } } }