How to force overriding a method in a descendant, without having an abstract base class?

Question

Question Heading seems to be little confusing, But I will Try to clear my question here.

using System;
using System.Collections.Generic;
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Answer 1

A WA may be using an "Interface" so you define one like IBonusGiver { void GiveBonus(); } An then, instead of the abstract method and the overrides, you implement in all your classes this new interface. e.g. PTSalesPerson : SalesPerson, IBonusGiver forcing a new implementation in each class.