private void добавитьToolStripMenuItem_Click(object sender, EventArgs e)
        {
            AddSubcategoryForm addSubcategoryForm = new AddSubcategoryForm(dB.Add(), categoryDB);

            addSubcategoryForm.ShowDialog();
            dB.Save();
        }
        private void редактироватьToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (listView1.SelectedIndices.Count == 0)
            {
                return;
            }
            SubCategory        subCategory        = (SubCategory)listView1.SelectedItems[0].Tag;
            AddSubcategoryForm addSubcategoryForm = new AddSubcategoryForm(subCategory, categoryDB);

            addSubcategoryForm.ShowDialog();
            dB.Save();
        }