Although I’ve been talking about the TextBlock since the early pages of this book, it’s time to look at it in just a little bit more detail. The TextBlock element has five font-related properties: FontFamily, FontSize, FontStretch, FontStyle, and FontWeight.
As you saw earlier, you can set FontStyle to either Normal or Italic. In theory, you can set FontStretch to values such as Condensed and Expanded but I’ve never seen these work in Silverlight. Generally you’ll set FontWeight to Normal or Bold, although there are other options like Black, SemiBold, and Light.
TextBlock also has a TextDecorations property. Although this property seems to be very generalized, in Silverlight there is only one option: