Sealed method in C#

Well, you are testing with only two levels of inheritance, and you are not getting to the point that you’re “further overriding” a method. If you make it three, you can see what sealed does:

class Base {
   public virtual void Test() { ... }
}
class Subclass1 : Base {
   public sealed override void Test() { ... }
}
class Subclass2 : Subclass1 {
   public override void Test() { ... } // Does not compile!
   // If `Subclass1.Test` was not sealed, it would've compiled correctly.
}