Switch on Condition

[bhar_s]

I went through your VI. Thank you for your reply. In my case I have to clears the graph when state changes. dont want to use a additional button kinda reset button.

I have attached a VI. I tried to show my application through that code.please go through it.

[crossrulz]

This example might suite you better.  I used a notifier to tell when to "acquire" the data.  I changed the start button to run to make it more clear what it is.  When the button is pressed, if it goes TRUE it clears the history and then sends the notification.  If it goes false, another notification is sent to stop the acquisition.