private void btnConvertExcel_Click(object sender, EventArgs e)
 {
     Class.ExportToExcel.Export2Excel(dgvPrintSaleMonthYearsExcel);
     frmCheckSalePosMonthYears frm = new frmCheckSalePosMonthYears();
     frm.Close();
 }
        private void btnSalePosMonthYearsExcel_Click(object sender, EventArgs e)
        {
            if (!DBConnString.clsDB.IsConnected()) return;
            SalePos7CSK.frmCheckSalePosMonthYears rpt = new frmCheckSalePosMonthYears();
            rpt.StartPosition = FormStartPosition.CenterScreen;   // กำหนด frm ย่อย ให้อยู่ตรงกลาง
            string Month = Menu_CboMonth.SelectedIndex.ToString();
            string Year = Menu_CboYear.SelectedIndex.ToString();

            rpt.setSaleMonth = Month;
            rpt.setSaleYear = Year;
            rpt.ShowDialog();
        }