retrieving value from custom dropdownbutton to the next view

[yatibawri]

Hi all,

I am facing a problem in retrieving the value from the dropdown button to the next view.
The main issue is:When i select a value from the button(dropdown) and click on the button(to go to the next view) it shows me the value that i have selected,
a.BUT,When i come back through the navigation controller and change the selected value to another and go to the next view,it shows me the same previously selected value,it does not show me the value that i have selected.
I am not getting it why is it happening so.
b.And if i do not select any value from the button(dropdown) it shows me null value in the next view.

Hope i am clear.If any doubt please ask me.
Please help me to solve the query experts.

Thanks.