How can I execute a vi when a switch changes

I have a switch which controls the input to a VI (it is slightly more complicated than that, but that's the basic idea).
The VI is a "set" function. So it really should only execute when the value changes.
Is there some way to set the switch so that there is only data available on the output when the switch is switched, thus executing the VI once?
If not, what is the best way to do this?
Thank you.
B.

BPerlman wrote:
Thank you.
An event structure sounds like just what I need. I am not going to get into the design patterns you mentioned here .... this is a demo program and there is a switch on the front panel that demos a feature in our library, turning it on and off. I just want to call a library function to turn the feature on or off at user request....the rest of the demo works (right now, I call the VI to turn on/off the feature every time through my main loop -- this is ugly and causes us timing problems... but everything else is finished)
I tried to add an event structure but don't seem to have it in my edition of LabVIEW....
What I just added now is a shift register to save the value of the switch between loop iterations, and I compare it to the current value, then feed it into a true/false case structure, only calling my "set" VI when the two values are different...
Is there a better way, or is that all I can do unless my company buys a fancier LabVIEW version?
Thanks.
B.
Shameless plug for an idea in the idea exchange. Since this would have helped you resolve your issue you might want to consider giving a kudo to this idea.
The way you are doing it now with the shift register is pretty much the only way you can do this without using an event structure.
Mark Yedinak
"Does anyone know where the love of God goes when the waves turn the minutes to hours?"
Wreck of the Edmund Fitzgerald - Gordon Lightfoot

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