How do I set previously selected radio button checked in wizard control?

See more:

C#

ASP.NET

Visual-Studio

I am going to build online examination system in asp.net using c#.I have created a wizard for online exam but whenever I go to next step and then come back to previous step what I found is the selected radiobuttonr remain unselected. Why this is happening? and what is the solution?

One more question I want to ask :- can I place timer, exam name and total marks at the top of every step without repeating it in every step in wizard control? If yes,then how?

What I have tried:

HERE IS THE .cs CODE OF FIRST STEP OF WIZARD :-

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Data;
using System.Configuration;

public partial class Demo : System.Web.UI.Page
{
    SqlConnection con;
     
    public Demo()
    {
        con = new SqlConnection();
        con.ConnectionString = ConfigurationManager.ConnectionStrings["ConnectionString"].ToString();
        
    }


    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void wizard1(Object sender, System.EventArgs e)
    {
        SqlDataAdapter adp = new SqlDataAdapter("select top 10 Question,Option1,Option2,Option3,Option4 from Questions", con);
        DataTable dt = new DataTable();
        adp.Fill(dt);
        Repeater1.DataSource = dt;
        Repeater1.DataBind();


    }
}

If there is any mistake in the code then please specify