static void Main(string[] args) { BaseClass bc = new BaseClass(); DerivedClass dc = new DerivedClass(); BaseClass bcdc = new DerivedClass(); // The following two calls do what you would expect. They call // the methods that are defined in BaseClass. bc.Method1(); bc.Method2(); // Output: // Base - Method1 // Base - Method2 // The following two calls do what you would expect. They call // the methods that are defined in DerivedClass. dc.Method1(); dc.Method2(); // Output: // Derived - Method1 // Derived - Method2 // The following two calls produce different results, depending // on whether override (Method1) or new (Method2) is used. bcdc.Method1(); bcdc.Method2(); // Output: // Derived - Method1 // Base - Method2 }