private void Product(DateTime date)
        {
            ok = false;

            SaveFileDialog fileDialog = new SaveFileDialog();

            fileDialog.Title      = "Exportar para Excel";
            fileDialog.FileName   = "Produtos - " + date.ToString("yyyy-MM-dd");
            fileDialog.DefaultExt = "*.xlsx";
            fileDialog.Filter     = "*.xlsx | *.xlsx";
            fileDialog.FileOk    += FileDialog_FileOk;
            fileDialog.ShowDialog();

            if (ok == false)
            {
                Application.Current.Dispatcher.BeginInvoke(DispatcherPriority.Background, new Action(() => this.Close()));
                return;
            }

            string fileName = fileDialog.FileName;

            try
            {
                File.Copy("Excel\\produtos.xlsx", fileName, true);
                value += 1;
            }
            catch (IOException ex)
            {
                MessageBox.Show(ex.Message);
            }

            try
            {
                app      = new m_Excel.Application();
                workbook = app.Workbooks.Open(fileName);

                worksheet = workbook.Worksheets[1];
                string day = date.ToString("yyyy-MM-dd");
                worksheet.Cells[1, 1] = "DIÁRIO - " + day;
                List <Relatorio.P> products = Relatorio.Product(day);
                value += 1;
                for (int i = 0; i < products.Count; i++)
                {
                    worksheet.Cells[i + 3, 1] = products[i].Cod;
                    worksheet.Cells[i + 3, 2] = products[i].Name;
                    worksheet.Cells[i + 3, 3] = products[i].Price;
                    worksheet.Cells[i + 3, 4] = products[i].Quantity;
                    worksheet.Cells[i + 3, 5] = products[i].Total;
                }
                value += 1;

                worksheet = workbook.Worksheets[2];
                DateTime date1 = date.StartOfWeek(DayOfWeek.Saturday);
                DateTime date2 = date1.AddDays(6);
                date1 = date1.AddDays(-1);
                date2 = date2.AddDays(1);
                string startDate = date1.ToString("yyyy-MM-dd");
                string endDate   = date2.ToString("yyyy-MM-dd");
                worksheet.Cells[1, 1] = "SEMANAL - " + startDate + " - " + endDate;
                products = Relatorio.Product(startDate, endDate);
                value   += 1;
                for (int i = 0; i < products.Count; i++)
                {
                    worksheet.Cells[i + 3, 1] = products[i].Cod;
                    worksheet.Cells[i + 3, 2] = products[i].Name;
                    worksheet.Cells[i + 3, 3] = products[i].Price;
                    worksheet.Cells[i + 3, 4] = products[i].Quantity;
                    worksheet.Cells[i + 3, 5] = products[i].Total;
                }
                value += 1;

                worksheet = workbook.Worksheets[3];
                string month = date.ToString("yyyy-MM");
                worksheet.Cells[1, 1] = "MENSAL - " + month;
                products = Relatorio.Product(month);
                value   += 1;
                for (int i = 0; i < products.Count; i++)
                {
                    worksheet.Cells[i + 3, 1] = products[i].Cod;
                    worksheet.Cells[i + 3, 2] = products[i].Name;
                    worksheet.Cells[i + 3, 3] = products[i].Price;
                    worksheet.Cells[i + 3, 4] = products[i].Quantity;
                    worksheet.Cells[i + 3, 5] = products[i].Total;
                }
                value += 1;

                worksheet = workbook.Worksheets[4];
                string year = date.ToString("yyyy");
                worksheet.Cells[1, 1] = "DIÁRIO - " + year;
                products = Relatorio.Product(year);
                value   += 1;
                for (int i = 0; i < products.Count; i++)
                {
                    worksheet.Cells[i + 3, 1] = products[i].Cod;
                    worksheet.Cells[i + 3, 2] = products[i].Name;
                    worksheet.Cells[i + 3, 3] = products[i].Price;
                    worksheet.Cells[i + 3, 4] = products[i].Quantity;
                    worksheet.Cells[i + 3, 5] = products[i].Total;
                }
                value += 1;

                workbook.Save();
                workbook.Close(true, misValue, misValue);
                value += 1;

                Application.Current.Dispatcher.BeginInvoke(DispatcherPriority.Background, new Action(() => this.Close()));

                Process.Start(fileName);
            }
            catch (Exception ex)
            {
                throw ex;
            }
            finally
            {
                app.Quit();
            }
        }