Answer Posted / ashish modi

class X
{
protected virtual void F() { Console.WriteLine("X.F"); }
protected virtual void F2() { Console.WriteLine
("X.F2"); }
}
class Y : X
{
sealed protected override void F() { Console.WriteLine
("Y.F"); }
protected override void F2() { Console.WriteLine
("X.F3"); }
}
class Z : Y
{
// Attempting to override F causes compiler error
CS0239.
// protected override void F() { Console.WriteLine
("C.F"); }

// Overriding F2 is allowed.
protected override void F2() { Console.WriteLine
("Z.F2"); }
}

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