Why should Dispose() be non-virtual?

Question

I\'m new to C#, so apologies if this is an obvious question.

In the MSDN Dispose example, the Dispose method they define is non-virtual. Why is that? It seems odd

Answer 1

If the base class has resources that need to be cleaned up at Dispose() time, then having a virtual Dispose method that's overridden by an inheriting class prevents those resources from being released unless the inheriting class specifically calls the base's Dispose method. A better way would implement it would be to have each derived class implement IDisposable.