As a disclaimer, I'm a Java developer, but this book can't be left aside. If you are a follower of the Clean Code movement this is the right book for you. Perhaps the most 'engineer-oriented' book written by Robert C. Martin and Micah Martin.
It covers several concepts about agile development, design patterns, programming, anti-patterns and some code katas to have fun with.
[ Agile Principles, Patterns, and Practices in C# ]