C# Clock数字时钟例子及时钟控件，MaskedTextBox.dll这个不知道是干什么用的，好像与时钟程序没有关系，是不是作者搞错了呀？本程序是在窗口中显示一个与Windows时间相符的数字时钟程序。-C# Clock Digital Clock example, and clock controls, MaskedTextBox.dll this do not know what to use, it seems there is no relationship with the clo