Please note: 

Chapter 1 and Appendix A have no accompanying code download.

Appendix B is a continuation of the discussion of the Rent-a-Wheels sample application. The complete code for the sample application is a part of Chapter 4 code download. Consequently, there is no dedicated code download for Appendix B. So for code examples that you encounter in Appendix B, please refer to the Chapter 4 code download.