protected void btnExportXML_Click(object sender, EventArgs e)
        {
            if (Page.IsValid)
            {
                try
                {
                    string fileName = string.Format("customers_{0}.xml", DateTime.Now.ToString("yyyy-MM-dd-HH-mm-ss"));

                    CustomerCollection customers = GetCustomers();
                    string             xml       = ExportManager.ExportCustomersToXML(customers);
                    CommonHelper.WriteResponseXML(xml, fileName);
                }
                catch (Exception exc)
                {
                    ProcessException(exc);
                }
            }
        }