用c#编的一个invoice打印程序，里面同时调用了vb.net的程序。算是一个中小型的程序，是学习如何跨入编大型应用程序的一个很好参考。欢迎大家完善，开发出更好的发票的打印！-With c# Made an invoice print program, which at the same time call a vb.net procedure. Procedures can be considered a small and medium-sized, is to learn how to