how to create a namespace in c#

[reproduce]how to create domain in windows server 2012.

3从世界级程序开始,代码解释_c#代码解读-csdn博客

introduction to c# - wordpress.com

命名空间(namespace):c#中用于为功能分类的对象,相当于我们用硬盘

c# using的使用方法

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