How to maintain state for repeater while paging

Question

Hi,

I developed one online question paper using asp.net. i had done paging for question paper such that it shows 5 questions per page using repeater. now i selected first 5 questions answers (radiobuttons) and i click next button for next page. and i come to previous page then the data what i selected for early 5 questions were un checked . to maintain data through out my application what should i do. can anybody please help me.

i attached my application . Please check it. i am waiting for ur valuable information


Thanks&Regards
Nagaraju.p