Head A C # Chinese version chapter II page52

Profiling a program

The code for each C # program is organized in the same way. All programs use namespaces, classes, and methods to make your code manageable.

Let's take a closer look at your code.

Open the Form1.cs of your Address Book project and we'll take a look at 1.1. 1 code file to reference. NETFramework tools to start

You can see a heap of write-using rows at the beginning of each code. They told C # to use it. Which part of the netframework. If you want to use a class of other namespaces, add your own using to reference them. Because forms often use some. NETFramework tools, the IDE automatically adds them.