Vb设置窗体不能移动到屏幕以外的地方，也就是碰到屏幕边缘，它就不能再拖动了，与窗体吸附有点相似，有进修我们这种功能还是挺有用处的。-Vb set form can not be moved outside the screen, which is encountered edge of the screen, it can no longer drag, and with the adsorption of somewhat similar form, there are studies that we use in this function or winter ridge.