Category Archives: Books

Writing and speaking update

This post has a few purposes – it’s partly a bit of advertising, but it’s also meant to serve as a quick way of replying to speaking requests for a while… if you’ve been directed here by an email from me, I hope you’ll excuse the “form letter” approach. (You can probably skip down to the bottom.)

Upcoming speaking engagements

I’ve got a few speaking engagements in the next four months:

  • December 2nd, hack.summit(): Humanity: Epic Fail (not currently sure how Tony the Pony will handle working with a webcam, but we’ll see)
  • December 3rd, NDC London: Abusing C#
  • January 6th-9th: CodeMash: workshop on LINQ, and a session on testing with Roslyn
  • February 27th: NorDevCon: Keynote (!) on passion, and C# 6 (probably with a bit of Roslyn too)

New book under development: Grokking C#

A long time ago I wrote about my hope to write two books: C# in Style and C# from Scratch. As you may have noticed, these haven’t happened yet, although I have had a couple of abortive attempts.

I’ve been working with my publisher (Manning) to think about the best way of introducing C# to newcomers, and we’ve made solid progress on a book with the working title of “Grokking C#” (subtitle: getting stuff done with objects). The aim will be to introduce both C# and OO hand-in-hand… not just “enough OO to understand the syntax of C#” but hopefully enough of the big picture to encourage readers to think about objects in a way which will last them long beyond the short time they’re reading the book.

The “Grokking” series from Manning is a pretty new one, but I’m really excited about the approach – it’s very visual, with a lot of thought put into reducing cognitive load. Have a look at Grokking Functional Programming for an idea of the style. If this sounds a bit like the Head-First books, there’s a good reason for that – Bert Bates who wrote Head-First Java with Kathy Sierra is acting in a consulting role for the Grokking books. However, the Grokking books have a style of their own – one which happens to take the things I like about the Head-First books, but without some of the aspects I’m less fond of.

I’m very much looking forward to learning a lot from Bert about getting a message out as clearly as possible. My blog, book and conference audience has always been reasonably advanced, and while I obviously answer Stack Overflow questions asked by newcomers, I haven’t done a large amount of writing for that audience. I expect this to be very challenging, but really rewarding.

No more speaking engagements…

Now for the bit which is tricky to tell conference organizers: I’m not going to accept any extra speaking engagements until the book is done, at least in first draft.

Writing the book is going to take a lot of my time, some of which would otherwise be family time… and currently speaking is taking about half of my vacation allocation each year. If I tried to continue with the speaking and the book, my family would suffer – and they don’t deserve that.

Don’t get me wrong – I still love speaking, and I’ll look forward to returning to the conference scene when I’m done, assuming anyone still wants me. Hopefully by then I’ll have some fresh ideas for talks as well. (I’ve been considering “Techniques for persuading people you’re an expert when you’re not” as a soft-skills talk, although I’m not sure I want to give away the secret…)

Apologies to conference organizers who I’ve already put off a few times with “ask me next year” – people trust me when I say it isn’t personal. If I had more time (or didn’t have a family!) I’d love to spend my life travelling around the world giving talks and chatting with developers. There just aren’t enough hours in the day :(

Book Review: Async in C# 5.0


A while ago I was attending one of the Developer, Developer, Developer conference in Reading, and I heard Alex Davies give a talk about actors and async. He mentioned that he was in the process of writing a short book for O’Reilly about async in C# 5, and I offered to review it for him. Many months later (sorry Alex!) I’m finally getting round to it.

Disclaimer: The review copy was given to me for free, and equally the book is arguably a competitor of the upcoming 3rd edition of C# in Depth from the view of readers who already own the 2nd edition… so you could say I’m biased in both directions. Hopefully they cancel out.

This is a book purely on async. It’s not a general C# book, and it doesn’t even cover the tiny non-async features in C# 5. It’s all about asynchrony. As you’d expect, it’s therefore pretty short (92 pages) and can comfortably be consumed in a single session. Alex’s writing style is informal and easy to read. Of course the topic of the book is anything but simple, so even though you may read the whole book in one go first time, that doesn’t mean you’re likely to fully internalize it straight away. The book is divided into 15 short chapters, so you can revisit specific areas as and when you need to.


I’ve been writing and speaking about async for about two and a half years now. I’ve tried various ways of explaining it, and I’m pretty sure it’s one of those awkward concepts which really just needs to click eventually. I’ve had some mails from people for whom my explanation was the one to do the trick… and other mails from folks who only "got it" after seeing another perspective. I’d encourage anyone learning about async to read a variety of books, articles, blog posts and so on. I don’t even think it’s a matter of finding the single "right" explanation for you – it’s a matter of letting them all percolate.

The book covers all the topics you’d expect it to:

  • Why asynchrony is important
  • Drawbacks of library-only approaches
  • How async/await behaves in general
  • Threading and synchronization contexts
  • Exceptions
  • Different code contexts (ASP.NET, WinRT, regular UI apps)
  • How async code is compiled

Additionally there are brief sections on unit testing, parallelism and actors. Personally I’d have preferred the actors part to be omitted, with more discussion on the testing side – particularly in terms of how to write deterministic asynchronous tests. However, I know that Alex is a big fan of actors, so I can forgive a little self-indulgence on that front.

There’s one area where I’m not sure I agree with the advice in the book: exceptions. Alex repeatedly gives the advice that you shouldn’t let exceptions go unobserved. I used to go along with that almost without thinking – but now I’m not so sure. There are definitely cases where that definitely is the case, but I’m not as comfortable with the global advice as I used to be. I’ll try to put my thoughts in order on this front and blog about this separately at a later date.

That aside, this is a good, pragmatic book. To be honest, I suspect no book on async is going to go into quite as many details as the PFX team blog, and that’s probably a good thing. But "Async in C# 5.0" is a very good starting point for anyone wanting to get to grips with async, and I in no way begrudge any potential C# in Depth 3rd edition sales I may lose by saying so ;)

C# in Depth 3rd edition available for early access, plus a discount code…

Readers who follow me on Twitter or Google+ know this already, but…

The third edition of C# in Depth is now available for early access from its page on the Manning website. I’ve been given a special discount code which expires at midnight EST on February 17th, so be quick if you want to use it – it gives 50% off either version. The code is “csharpsk”.

It’s likely that we’ll have a separate (permanent) discount for readers who already own the second edition, but the details of that haven’t been decided yet.

Just to be clear, the third edition is largely the second edition plus the changes to cover C# 5 – I haven’t done as much rewriting as I did for the second edition, mostly because I was already pretty happy with the second edition :) Obviously the largest (by far) feature in C# 5 is async/await, which is covered in detail in the new chapter 15.

The future of “C# in Depth”

I’m getting fairly frequent questions – mostly on Twitter – about whether there’s going to be a third edition of C# in Depth. I figure it’s worth answering it once in some detail rather than repeatedly in 140 characters ;)

I’m currently writing a couple of new chapters covering the new features in C# 5 – primarily async, of course. The current "plan" is that these will be added to the existing 2nd edition to create a 3rd edition. There will be minimal changes to the existing text of the 2nd edition – basically going over the errata and editing a few places which ought to mention C# 5 early. (In particular the changes to how foreach loop variables are captured.)

So there will definitely be new chapters. I’m hoping there’ll be a full new print (and ebook of course) edition, but no contracts have been signed yet. I’m hoping that the new chapters will be provided free electronically to anyone who’s already got the ebook of the 2nd edition – but we’ll see. Oh, and I don’t have any timelines at the moment. Work is more demanding than it was when I was writing the first and second editions, but obviously I’ll try to get the job done at a reasonable pace. (Writing about async in a way which is both accessible and accurate is really tricky, by the way.)

Of course when I’ve finished those, I’ve got two other C# books I want to be writing… when I’m not working on Noda Time, Tekpub screencasts etc…


I had a question on Twitter around the "two other C# books". I don’t want to go into too many details – partly because they’re very likely to change – but my intention is to write "C# from Scratch" and "C# in Style". The first would be for complete beginners; the second wouldn’t go into "how things work" so much as "how to use the language most effectively." (Yes, competition for Effective C#.) One possibility is that both would be donationware, at least in ebook form, ideally with community involvement in terms of public comments.

I’m hoping that both will use the same codebase as an extended example, where "From Scratch" would explain what the code does, and "In Style" would explain why I chose that approach. Oh, and "From Scratch" would use unit testing as a teaching tool wherever possible, attempting to convey the idea that it’s something every self-respecting dev does :)

Edulinq – the e-book

I’m pleased to announce that I’ve made a first pass at converting the blog posts in the Edulinq series into e-books.

I’m using Calibre to convert to PDF and e-book format. I still have a way to go, but they’re at least readable. The Kindle version (MOBI format) is working somewhat better than the PDF version at the moment, which surprises me. In particular, although hyperlinks are displaying in the PDF, they don’t seem to be working – whereas at least the internal links in the Kindle format are working.

I’ll no doubt try to improve things over time, but I’ve put these early attempts up on the download page of the Edulinq project site. I’ve also put all the blog posts up as HTML in the site’s source control; that means you can browse the latest version directly. It also means if you sync the source control, download Calibre yourself and add "index.html" as a new e-book in the Calibre library, you can play with the conversion yourself and help me improve things. Feedback about problems is welcome; feedback including the fix is even better :)

C# in Depth 2nd edition: now available in mobi/epub (Kindle) format

I’m not quite sure why this hasn’t been emailed to all existing owners, but the ebook of C# in Depth 2nd edition is now available in mobi and epub form, as well as PDF.

You can download it from the Manning user account site. You need to have the existing ebook first, but if you have the hard copy there should be a voucher in the front which will let you get the ebook for free. (This should work wherever you bought the hard copy from; it doesn’t matter whether you originally ordered it from Manning or not.) If you don’t already have a login for the user account site, just register using the same email address that the ebook was sent to. That way the system automatically credits you with all the ebooks you’ve bought. If you have had ebooks delivered to multiple email addresses, you can add those in the settings page.

Anyway, click on the link to C# in Depth, and you can download the book in any of the listed formats – if you want to use it on a Kindle, just download the mobi file, copy it to the Kindle and you should be well away.


C# in Depth 2nd edition: ebook available, but soon to be updated

Just a quick interrupt while I know many of you are awaiting more asynchronous fun…

Over the weekend, the ebook of C# in Depth 2nd edition went out – and a mistake was soon spotted. Figure 2.2 was accidentally replaced by figure 13.1. I’ve included it in the book’s errata but we’re hoping to issue another version of the ebook shortly. Fortunately this issue only affects the ebook version – the files shipped to the printer are correct. Speaking of which, I believe the book should come off the printing press some time this week, so it really won’t be much longer before you can all physically scribble in the margins.

We’re going to give it a couple of days to see if anything else is found (and I’m going to check all the figures to see if the same problem has manifested itself elsewhere) – but I expect we’ll be issuing the second "final" version of the ebook late this week.

EDIT: A lot of people have asked about an epub/mobi version of the ebook. I don’t have any dates on it, but I know it’s something Manning is keen on, and there’s a page declaring that all new releases will have an epub/mobi version. I’m not sure how that’s all going to pan out just yet, but rest assured that it’s important to me too.