How to use the same button to control run or stop of the program?

I want to run a program when I press Boolen2, I use switch when press. So when I press it, it will turn "on" stature. There is a loop in the program. I want to stop it, when press the button again, that is when make the button from "on" statue to "off" stature.
But I don't know why it doesn't work in my vi. And is there other good way?
Thank you.
Attachments:
question2.vi ‏124 KB

Hi,
Thank you very much.Please download this file and save it under the same path,and change its extern name to dll.
I have tried follow your vi. But this method doesn't work properly in my vi. I don't know why.
Maybe it is because there is a highspeed data acquisition working in the loop. And I have tried to wait 100ms every loop.But it doesn't work.
Thank you for your help.
Hugo Liang.
Attachments:
MP421.txt ‏237 KB

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