Visual Basic.net 2010 中级教课书，Welcome to Microsoft’s Visual Basic 2010, another milestone version of the most popular
programming language for building Windows and web applications. In modern software development,
however, the language is only one of the components we use to build applications.
The most important component is the .NET Framework, which is an indispensable component
of every application; it’s actually more important than the language itself. You can think of
the Framework as an enormous collection of functions for just about any programming task.
All drawing methods, for example, are part of the System.Drawing class. To draw a rectangle,
you call the DrawRectangle method of the System.Drawing class, passing the appropriate
arguments. To create a new folder, you call the CreateDirectory method of the Directory
class, and to retrieve the files in a folder, you call the GetFiles method of the same class.
