I have 1e, 3e, 4e of this book, 1e was a classic, but from 3e, the format changed and a dozen or so annotators joined to contribute to the somewhat dry language description. This was certainly a good thing. However, it would have been better if someone more carefully reviewed the text.
I found two obvious errors in the first 50 pages:
p38: the classes Student and Employee should derive from Person.
p48: "Unfortunately, with the event keyword, Completed is just a public field of type delegate,
which can be stepped on by anyone who wants to"
which should read "..., without the event keyword...".
These might be minor details to an experienced reader, but for someone new to C#, it's very confusing.
What's more annoying is the lack of a place to submit errata so that new printings can correct these defects.