how to find our session value in grid view

my aspx code

cs.code

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Data;

using System.Data.SqlClient;

public partial class _Default : System.Web.UI.Page

{

protected void Page_Load(object sender, EventArgs e)

{

bind();

}

public void bind()

{

SqlConnection con = new SqlConnection();

con.ConnectionString = "data source=RANA; uid=sa;password=master; database=mib;";

string qu = "select link_level3,idno from level3 where language='eng'";

SqlDataAdapter da = new SqlDataAdapter(qu, con);

DataSet ds = new DataSet();

da.Fill(ds);

GridView1.DataSource = ds;

GridView1.DataBind();

}

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)

{

if (e.Row.RowType == DataControlRowType.DataRow)

{

HyperLink hl = (HyperLink)e.Row.FindControl("hgb");

if (hl != null)

{

DataRowView drv = (DataRowView)e.Row.DataItem;

Session["id"] = drv["idno"].ToString();

//string companyname = drv["CompanyName"].ToString();

hl.NavigateUrl = "~/Default2.aspx?idno=" + Session["id"].ToString();

}

this code prblem here

only find out one session id in gridview of last row

i want click any row find session value this row

i want use only session not query string