Can't use virtual and override on the same method in C#

Question

So apparently you cannot use the virtual modifier with the override modifier.

virtual - a method that can be overridden

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Answer 1

virtual means your method is dispatched through a virtual method table. If a method's virtual, any reference to that method on a derived class has to go through the vtable. You can't non-virtualize it just because a derived class overrides it - what would happen if LittleLine was cast to DrawingObject? You still need to find the correct implementation, which wouldn't be DrawingObject's