How do I override the setter method of a property in C#?

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I have a class with a subclass. The superclass has a Position property. The subclass must perform an additional operation when the Position property is changed, so I am attempting to override the setter method and call the superclass' setter.

I think I've got the superclass setter calling part down, but I can't figure out how the overriding syntax works here.

Here is my best attempt: code

The getter is there just for proof of concept -- suppose I wanted to override that too?

The getter and setter give me errors of this form:

cannot override inherited member 'superClassName.Position.[gs]et' because it is not marked virtual, abstract, or override

Here's a screencap of the errors too for good measure: errors

I also tried using the override keyword in front of the set. Removing the superfluous getter has no effect.

What is the correct syntax?

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