// Download all Battery data as a CSV
        protected void DownloadBtn_Click(object sender, EventArgs e)
        {
            int batchId = 0;

            try
            {
                batchId = Int32.Parse(Security.GetQueryString());
            }
            catch
            {
                Security.RedirectToHomePage();
            }

            if (BatchService.DownloadSpreadsheet(batchId))
            {
                // Do nothing
            }
            else
            {
                Response.Redirect("BatchDetail.aspx?id=" + batchId + "&message=DownloadError");
            }
        }