public class Base { public bool Foo() { return true; } } public class Derived : Base { public new void Foo() { } public static void Main() { Base obj = new Derived(); bool foo = obj.Foo(); } } ??????? ?? obj ? ???????? Inline variable. ??? ?????????, ?????????? ?? ??? ????? ? ????????? ?? ?????????????: public static void Main() { bool foo = new Derived().Foo(); /* Cannot convert 'void' to 'bool' */ } ? ??????? ???: public static void Main() { bool foo = ((Base) new Derived()).Foo(); }