Recent use asp.net made a Invoicing System

Recent use asp.net made a Invoicing system, the more the more to the back where modification program contained increasingly chaotic.
Just started at the right time also thinking about how good structure, optimize system and other programs. But now much changed, the previous design problems manifested, but do not have time to go rework functionality only on it. confused_smile.gif

I do not know whether the experts who have the same problem before, you is how to solve this issue?

Reproduced in: https: //www.cnblogs.com/baoposhou/archive/2004/05/27/11670.html

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Origin blog.csdn.net/weixin_33938733/article/details/93320696