private void frmDM_OrderType_OnThemMoi(object sender, EventArgs e)
        {
            isAdd = true;
            frmChiTiet_OrderType frm = new frmChiTiet_OrderType(this);

            frm.ShowDialog();
        }
 private void frmDM_OrderType_OnGridDoubleClick(object sender, EventArgs e)
 {
     if (Oid > 0)
     {
         isAdd = false;
         frmChiTiet_OrderType frm = new frmChiTiet_OrderType(this);
         frm.ShowDialog();
     }
 }