static void Main() { DerivedType derived = new DerivedType(); // Calls DerivedType.MethodOne. derived.MethodOne("string1", "string2"); // Calls BaseType.MethodOne. derived.MethodOne("string1", (object)"string2"); // Both of these call DerivedType.MethodTwo. derived.MethodTwo("string1", "string2"); derived.MethodTwo("string1", (object)"string2"); }