Errata

The books states:

"However, the same client will function just fine (without recompiling) if you change the order of the methods in the interface:

public interface IMyInterface
{
void Method2();
void Method1();
}

or if you add a new method:

public interface IMyInterface
{
void Method3();
void Method1();
void Method2();
}
"

The client will NOT work fine if a new "void Method3()" is added since the runtime will throw an exception complaining that the client didn't implement the new "Method3". .Net Interfaces are IMMUTABLE! The only change that I see possible is reordering the methods

When the object does not implement IDisposable, the compiler refuses to compile the code, claiming the object should be implicitly convertible to IDisposable. Therefore, a "using" statement can only be used with types which implement the IDisposable interface.

Template for deterministic finalization does not distinguish between Cleanup() called from finalizer and Cleanup() called from Dispose(). Cleanup() implementation therefor can't safely access or dispose member variables, it can only release unmanaged resources. This limitation is not made clear in the text.