说明：  过去，我们利用VB开发多线程的应用程序时，是一件很令人痛苦的事，经常是多线程的程序运行是会变成多错误的程序！但在VB.NET中，这种状况已经大为改观。现在，我们利用VB.NET处理多线程和利用JAVA处理多线程一样简单了
(past, we use Visual Basic to develop multithreaded applications, it is a very painful thing Multithreading is often the procedure is running into the wrong procedure! In VB.NET, the situation has improved significantly. Now, we use VB.NET processing multithreaded processing and the use of multi-threaded Java as simple as a)