Popup window on image map hotspot click

private void createhotspots(Label lb)
   {
       SqlConnection objcon = new SqlConnection(strCon);
       objcon.Open();
       string strQuery = "select * from PapersInfo where PageNo='"+lb.Text +"' and PaperDate='"+DropDownList1 .SelectedItem .Text +"'";
       SqlCommand cmd = new SqlCommand(strQuery, objcon);
       SqlDataReader dr = cmd.ExecuteReader();
       string strne = string.Empty;

       while (dr.Read())
       {
           int top = Convert.ToInt32(dr[5].ToString());
           int bottom = Convert.ToInt32(dr[6].ToString());
           int left = Convert.ToInt32(dr[7].ToString());
           int right = Convert.ToInt32(dr[8].ToString());
           RectangleHotSpot RectangleHS = new RectangleHotSpot();
           strne = dr[4].ToString();
           RectangleHS.Top = top;
           RectangleHS.Left = left;
           RectangleHS.Right = right;
           RectangleHS.Bottom = bottom;
           RectangleHS.AlternateText = "Click to View";
           ImageMap1.HotSpots.Add(RectangleHS);

        RectangleHS.NavigateUrl = "image.aspx?" + dr[4].ToString();
    }
}