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

I think you simply misunderstood how virtual works. It's not limited to one level of inheritance, as explained here, for example:

For every virtual method declared in or inherited by a class, there exists a most derived implementation of the method with respect to that class. The most derived implementation of a virtual method M with respect to a class R is determined as follows:
•If R contains the introducing virtual declaration of M, then this is the most derived implementation of M.
•Otherwise, if R contains an override of M, then this is the most derived implementation of M.
•Otherwise, the most derived implementation of M with respect to R is the same as the most derived implementation of M with respect to the direct base class of R.