Yes, GridView is bound and works fine without the Cookies condition. I am using Edit DefaultMode. Below is my full code which returns the error: Object reference not set to an instance of an object (Line 21). Please assist.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button3_Click(object sender, EventArgs e)
    {
        foreach (DetailsViewRow gvr in DetailsView1.Rows)
        {
            if ((gvr.RowType == DataControlRowType.DataRow))
            {
                RadioButtonList rbl = ((RadioButtonList)(gvr.FindControl("radioButtonListI")));
                for (int j = 0; (j <= rbl.Items.Count); j++)
                {
                    if ((rbl.Items[j].Value == "5"))
                    {
                        if (Request.Cookies["Q1"] != null)
                        {
                            Response.Cookies["Q1"].Value = Label2.Text.ToString();
                            Response.Redirect("../QuestLocal/Q2.aspx");
                        }
                        else
                        {
                            Response.Cookies["Q1"].Value = Label2.Text.ToString();

                            Response.Redirect("../QuestLocal/Q3.aspx");
                        }
                    }
                }
            }
        }
    }