protected void btnCancel_Click(object sender, EventArgs e)
        {
            foreach (GridViewRow row in GridView1.Rows)
            {
                CheckBox chk = (CheckBox)row.FindControl("chkSelect");
                if (chk.Checked == true)
                {
                    int autoId = int.Parse(GridView1.DataKeys[row.RowIndex].Value.ToString());
                    CancelTicketClass cancelInstance = new CancelTicketClass();
                    cancelInstance.CancelTicket(autoId, Session["selectedBookingId"].ToString(),
                                                "101");
                }
            }

            Response.Redirect("BookingHistory.aspx");
        }