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abstract class A
{
    protected virtual void Foo() => Console.WriteLine("A.Foo");
}

abstract class B : A
{
    protected abstract override void Foo();
}

class C : B
{
    protected override void Foo()
    {
        Console.WriteLine("C.Foo");
        // base.Foo(); <-- Can't call the base method here
    }
}

                 Overall Abstract Class                         Framework for processing a "packet"
                /          |           \
               /           |            \
Type 1 Abstract     Type 2 Abstract     Type 3 Abstract         Additional framework for each packet "Class"
              \            |            /
               \           |           /
                  ~60 Concrete Classes                          Supplies processing implementation for each packet

abstract class A
{
  public abstract void X();
  public virtual void R() { return; }
}
abstract class B : A
{
  public abstract override void R();
}
class C : B
{
  public override void X() { return; }
  public override void R() { return; }
}

Marc Clifton wrote:

The macabre in me wonders why a fitness person was using whip cream.

Dan Neely wrote:

without consequences

Marc Clifton wrote:

why a fitness person was using whip cream

kmoorevs wrote:

The wife is going to have a fit when she sees the 30' cat6 cable snaking through the living room to my office!