Questions about Coding Practices

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I am reading "Programming .NET Components" 2nd Edition by Juval Lowy,
O'Reilly. In Appendix E, there is a chapter "Coding Practices" which I
agree and practice mostly. However, there are a few items I don't
quite understand why as listed below, my questions are marked Q:

10. Avoid method-level document.
a. Use extensive external documentation for API documentation.
b. Use method level comments only as tool tips for other developers.

Q: Visual Studio and SandCastle have provided comprehensive support
for in-source document, so I would thin that method-level
documentation is encouraged. For example, in IDE, after you add /// on
the top of a method, framework of in-source document for the method is
created.

29. Avoid using the trinary conditional operator.

Q: Is it really hard to read?

35. Always mark public and protected methods as virtual in a non-
sealed class.

Q: what is the incentive to mark all as virtual?

58. Do not use late-binding invocation when early binding is possible.

Q: Microsoft Application Blocks seem to encourage the uses of late-
binding invocation. Personally I like early binding as the compiler
may check errors for me.



Can you answer or make a comment?

Cheers

Daixing

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