Problem with GridView, ListItem and RadiobuttonList in asp.net

Hi,,

I m trying to create an online examination module which has to be very simple....

But what i want to do is to store a large number of questions and to obtain on 25 questions from it randomly, so that no two persons logging in same time may have the same questions....

then i just show all of them in a grid view..

in grid view i add a label and a radio button list to show the questions and their qbjective options.....

but the problem is that when i select the options and try to submit the selected index changed dramaticaaly other than the selection that we choose by our own...

I m attaching the code of the page below...

please review it ..

and any help in this context is highly apprecuiated....


using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public partial class Student_Panel_TakeExam : System.Web.UI.Page
{
Stud_Panel sp = new Stud_Panel();

int sid, subid;
DataSet ds, dsSession;
protected void Page_Load(object sender, EventArgs e)
{
// sid = Convert.ToInt32(Session["SID"]);
sid = 20; //THIS IS THE STUDENT ID JUST FOR TESTING
//subid = Convert.ToInt32(Request.QueryString[0]);
subid = 1; // THIS IS THE SUBJECT ID JUST FOR TESTING PURPOSE
if (!IsPostBack)
{

Session["Question"] = sp.GetQuesForExams(subid); // THIS FUNCTION ALWAYS OBTAIN THE QUESTIONS IN RANDOM ORDER
dsSession = (DataSet)Session["Question"]; // THIS IS TO PUT THE OBTAIND SHUFFLED QUESTIONS IN THE SESSION VARIABLE
GridView1.DataSource = dsSession;
GridView1.DataBind();

for (int i = 0; i < dsSession.Tables[0].Rows.Count; i++)
{
Control ctrl = GridView1.Rows.Cells[0].FindControl("lblQues"); // I HAVE ADDED A LABEL IN TEMPLATE FIELD OF THE GRIDVIEW
Label lblCtrl = ctrl as Label;
lblCtrl.Text = "<h3>" + (i + 1).ToString() + ". " + dsSession.Tables[0].Rows["Question"].ToString() + ".<br></h3>";

Control ctrl1 = GridView1.Rows.Cells[0].FindControl("rbl");
RadioButtonList rblctrl = ctrl1 as RadioButtonList;

int option = 3, ans = 5; // TO GET THE POSITIONS OF OPTIONS AND ANSWERS IN THE DATASET
for (int j = 0; j < 4; j++)
{
ListItem li = new ListItem(); // CREATE A LIST VIEW AS TO POPULATE THE RADIOBUTTON LIST
li.Text = dsSession.Tables[0].Rows[option].ToString();
li.Value = dsSession.Tables[0].Rows[ans].ToString();
//"<img src='30-02012010056.jpg' />";
rblctrl.Items.Add(li);
option = option + 3;
ans = ans + 3;

}
}
}
}
protected void btnSubmit_Click(object sender, EventArgs e)
{
dsSession = (DataSet)Session["Question"];

int count = 0;
for (int i = 0; i < dsSession.Tables[0].Rows.Count; i++)
{

Control ctrl1 = GridView1.Rows.Cells[0].FindControl("rbl");
RadioButtonList rblctrl = ctrl1 as RadioButtonList;
Label1.Text += "<br>" + rblctrl.SelectedItem;
}
}
}

 

please help me in the above problem.....