#613 – Interfaces Cannot Contain Static Members

An interface is a list of methods, properties, events and indexers that a class may implement.  All methods, properties and events defined in the interface are implicitly instance members, rather than static members.

    public interface IDogStuff
        bool CanBark { get; set; }
        void Bark();

        // Compile-time Error: The modifier 'static' is not valid for this item
        static string GenerateMotto();