How to restore the state of DLRadioButton while navigating from one controller to other?

[mr0perfect]

ASK1
I want to restore the states of buttons both radio-buttons and multi-check buttons while navigating from one controller to other controller. Right now what's happening is if I select one radio button option and go to next screen and come back to previous screen the radio button that I selected previously is not being showed as selected. What should be done to restore the buttons state?

ASK2
How to store all the selected multi-check boxes values in a single string/array with below code?