public static void Main()
{
BaseClass obj1 = new BaseClass();
DerivedClass obj2 = new DerivedClass();
obj1.MethodA();
obj2.MethodA();
obj2.MethodA(1);
}
public static void Main()
{
BaseClass s = new DerivedClass();
s.MethodA();
s.MethodB();
s.MethodC();
}
public static void Main()
{
DerivedClass obj = new DerivedClass();
obj.MethodA();
}