Missing References and other issues. about fourth-edition HOT 1 OPEN

Thanks so much for letting us know that you're seeing these issues! I really appreciate you taking the time to give such detailed feedback—it really helps us. I'll get in touch with the folks at O'Reilly and see we if we can get it sorted out. In the meantime, you can see the full images in the the PDF of chapters 1 to 4: Head_First_CSharp_4e_chapters_1_to_4.pdf (if you DM me on Twitter I'd be happy to have the folks at O'Reilly send you a PDF of the whole book).

You're right—the timer ticks every tenth of a second, so it adds 10 to tenthsOfSecondsElapsed each tick. That's okay because later on in the code we divide tenthsOfSecondsElapsed by 10 before we actually display it:

timeTextBlock.Text = (tenthsOfSecondsElapsed / 10F).ToString("0.0s");

And yes, you're right—they changed the WPF options in Visual Studio a bit since the book was printed. You should choose WPF .NET Core (but if you chose WPF .NET Framework the whole exercise should still work exactly the same, so it hopefully shouldn't prevent any learning).

Also, I really appreciate the feedback about the Debug exercise! We really try to lean on the Visual Studio debugger as a learning and exploration tool throughout the book. I hope you like the rest of it!

from fourth-edition.