Incorrect listing reference

Chapter 1: The changing face of C# development: P23, section 1.6

Created: 10/15/2013
Last updated: 10/15/2013
Severity: Typo

Directly after listing 1.21, I state that "The full method is a little longer than the one shown in listing 1.22," where of course I meant listing 1.21 instead - listing 1.22 doesn't exist.