private void btnOK_Click(object sender, EventArgs e)
        {
            try
            {
                DataTable dt = new DataTable();

                if (!m_personnerServer.ExcelDimission(dtpStartDate.Value, dtpEndDate.Value, out dt, out m_error))
                {
                    MessageDialog.ShowPromptMessage(m_error);
                }
                else
                {
                    ExcelHelperP.DataTableToExcel(saveFileDialog1, dt, null);
                }

                this.Close();
            }
            catch (Exception ex)
            {
                MessageDialog.ShowPromptMessage(ex.Message);
                this.Close();
            }
        }