Hi,
Here I gave you idea how to store user information temply
Use session variable to store data temporarly
like
DataTable dt=new DataTable();
dt.rows[0][0]="Questionid";
dt.rows[0][1]="userselected ans";
dt.rows[0][2]="correct ans";
Session["udata"]=dt;
After completing all questions you can display previous information
DataTable dt=(DataTable)Session["udata"];
Lblfrstans.Text=dt.rows[0][1].toString();
Lblscndans.Text=dt.rows[1][1].tostring();
I hope you know about session creation and how to use it
All the Best