private void addNewSupplyBtn_Click(object sender, EventArgs e)
        {
            var item   = _artSupplyRepo.GetForAdd();
            var dialog = new ArtSuppliesDialog(item, false, _artSupplyRepo.GetAllTypes());

            if (dialog.ShowDialog() == DialogResult.OK)
            {
                _artSupplyRepo.Add(dialog.Item);
                reloadArtSupplies();
            }
        }
        private void editSupplyBtn_Click(object sender, EventArgs e)
        {
            var selected = artSuppliesLv.SelectedIndices;

            if (selected.Count == 1)
            {
                var selectedIndex = selected[0];
                var item          = _artSupplyRepo.GetForEdit(_artSuppliesIds[selectedIndex]);
                if (item == null)
                {
                    return;
                }
                var dialog = new ArtSuppliesDialog(item, true, _artSupplyRepo.GetAllTypes());
                var result = dialog.ShowDialog();
                if (result == DialogResult.OK)
                {
                    _artSupplyRepo.Edit(dialog.Item);
                    reloadArtSupplies();
                }
            }
        }