Power Cycle Persistence

[Bpk9p4]

I was wondering if anyone has gotten persistence to work over power cycle. If so do you have any example code?

Edit:
To give a little more background i am trying to write a value from the Dashboard and have it be read on the robot. I have this part working. The problem i am having is how do i get the value to be save so that the next time i power the robot on it has the same value.

I am have been trying to used the persistence.ini on the roborio. However ever time i power the roborio off the values are wiped from the .ini file