03-01 The Anatomy of a Simple C# Program

On the Windows operating system, an application’s return value is stored within a system environment variable named %ERRORLEVEL%.

在Windows操作系统，一个应用程序的返回值被储存在一个命名为%ERRORLEVEL%系统环境变量里面。

Finally, you are also able to access command-line arguments using the static GetCommandLineArgs() method of the System.Environment type.