Sending Faxes with fax-modem and telephone line in C#
Using dependency injection with frequently-used background services can be a hassle. The Ambient Service Pattern is an easier alternative.
This article (and GitHub source code) describe how to design mapping rule by test case, and how to write il code to achieve good performance.
An exercise to measure the drift in the time-of-day clock on a Windows PC using the periodic timer.
A WPF chess application that uses the Stockfish chess engine