C04
代码说明：
本章实现了聊天室系统，功能包括用户登录、自动注册、用户发言、实时浏览发言、注销身份等。(This chapter to achieve the chat room system, features include user login, automatically register the user to speak, real-time views to speak, write-off status.)
文件列表：
C04
...\MyChatRoom
...\..........\App_Code
...\..........\........\BusinessLogicLayer
...\..........\........\..................\Message.cs
...\..........\........\..................\User.cs
...\..........\........\DataAccessLayer
...\..........\........\...............\Database.cs
...\..........\DB
...\..........\..\MyChatRoom.sql
...\..........\Images
...\..........\......\Thumbs.db
...\..........\Login.aspx
...\..........\Login.aspx.cs
...\..........\Main.aspx
...\..........\Main.aspx.cs
...\..........\ShowMessage.aspx
...\..........\ShowMessage.aspx.cs
...\..........\Speak.aspx
...\..........\Speak.aspx.cs
...\..........\Styles
...\..........\......\Style.css
...\..........\Web.config
...\readme.txt
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