我如何将窗体形式按钮拖动到特定点但只能在检查新点的位置后？

I would like to allow user to drag the button to a point either right(+X) or left(-X) based on which direction the user drags the button. I'm new to windows forms and a walk-through would be appreciated.(In my example, I hard-coded the new position increment by 10 pixels but I want the user to be able to drag the button as far as he wants). Here's my current code:I would like to allow user to drag the button t