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Thanks, I'm looking forward to this book, and retroactively reading the last one. I've been involved in development with C# in one way or another since 2007 or so and am always on the lookout for supplemental reading material about it, and .NET in general! It's a bonus when I actually know who the author is (not in real life, but on stack overflow that is).
In the preface there is a mention of the 3rd edition being included in the purchase of the 4th. Is that available yet or will that only be available when the book is completed?