public Refresher(Feature feature, RegisterRentalForm registerRentalForm)
 {
     _registerRentalForm = registerRentalForm;
     _feature = feature;
     _listNewRegister = new List<BookRegisterDTO>();
     LastUpdateTime = DateTime.Now;
     RefreshInterval = 10 * 1000;
 }
        private bool FocusRentalPage()
        {
            if (_registerRentalForm != null)
            {
                _registerRentalForm.Focus();
                return true;
            }
            _registerRentalForm = new RegisterRentalForm(_feature, this);
            _registerRentalForm.MdiParent = this;
            _registerRentalForm.Show();

            return false;
        }
 private void barBtnRegisterRental_ItemClick(object sender, ItemClickEventArgs e)
 {
     if (CheckLogin())
     {
         if (_registerRentalForm == null || _registerRentalForm.IsDisposed) _registerRentalForm = new RegisterRentalForm(_feature, this);
         else
         {
             _registerRentalForm.Focus();
             return;
         }
         _registerRentalForm.MdiParent = this;
         _registerRentalForm.Show();
     }
 }