说明：  本书主要针对想学习如何使用.NET Framework编写C#程序的所有人。本书前面章节介绍该语言本身，读者不需要具备任何编程经验。
(This book is for everyone who wants to learn how to write C# programs using the .NET Framework. The previous chapters of the book introduce the language itself, and the reader does not need any programming experience.)