java、c++、c#，vb等所编写的系统源码，包括图书管理系统等，可做实例应用-java, c++, c#, vb, etc. prepared by the system source code, including library management systems, examples of applications do

一个很好的vb完整源码，一个图书管理系统，很有用呀-A good vb full source code, a library management system, useful way