ASP.NET Radiobutton List Preserve Value

Question

hello people,

 

I'm creating a project which is basically a quiz containing some pool of questions .
The issue i'm facing is with the radiobutton list,  when user clicks the previous button then the selected value of the radiobuton list control is lost between postbacks.

 

The GUI  contains a next button for the next question which is running perfectly fine but as soon as the previous question button is clicked to view the previous question the previous selected value of the radio button is lost.

 

Please, help me, how can i preserve the value of radio button list

 

Regards

 

Thanks in advance