C# 版本的一个三层商业架构，不错 以前的版本是vb得，这个是改变后的C#版本 相当不错的一个商业的学习架构，简单明了， 层次清晰-C# versions of a three-tier business model, it is true the previous version is in vb. This is a change in the C# version is quite good in a commercial framework for learning simp

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