Updated to reflect VS new project generated file.
MODIFY
src/Chapter01/Listing01.01.HelloWorldInC#.cs
src/Chapter01/Listing01.01.HelloWorldInC#.cs
+// See https://aka.ms/new-console-template for more information
#region INCLUDE
-System.Console.WriteLine("Hello. My name is Inigo Montoya.");
+Console.WriteLine("Hello. My name is Inigo Montoya.");
#endregion INCLUDE

Updated to reflect VS new project generated file.