namespace SomeNamespace.MyInheritance

{

    public class BaseClass

    {

        public /*virtual*/ void Foo()

        {}

    }

​

    /*

    public class DerivedClassA : BaseClass

    {

        public override void Foo()

        {}

    }

    */

    public class DerivedClassB : BaseClass

    {

        public new void Foo()

        {}

    }

}