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< 30学通C#项目案例开发>>书中的项目源码，09年7月刚出版的新书，很实用，特别适合想快速入门C#项目开发的朋友学习,此乃第三章---企业级即时消息系统-" " 30-pass C# project case study development " " book project source code, in July 2009 the newly-published book, very practical, especially for quick start to C# project development, a friend learn This is the third chapter--- Enterprise grade instant messaging system