private void btnExcel_Click(object sender, EventArgs e)
        {
            ReportWriter reporter = new ReportWriter();
            String       msg      = "";

            using (SaveFileDialog sfd = new SaveFileDialog())
            {
                sfd.Filter = "Excel Files | *.xls";
                if (sfd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                {
                    if (sfd.FileName != "" && sfd.FileName.EndsWith(".xls"))
                    {
                        reporter.CreateSummaryReport(summaries, sfd.FileName, out msg);
                        if (msg != "Excel Report Saved")
                        {
                            MessageBox.Show(msg, "Report Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                        }
                        else
                        {
                            MessageBox.Show(msg, "Report", MessageBoxButtons.OK, MessageBoxIcon.Information);
                        }
                    }
                }
            }
        }