private void button1_Click(object sender, EventArgs e)
        {
            EditMenuItemForm editMenuItemForm = new EditMenuItemForm();

            editMenuItemForm.ShowDialog();
            if (editMenuItemForm.DialogResult == DialogResult.OK)
            {
                loadData();
            }
        }
        private void button2_Click(object sender, EventArgs e)
        {
            string           id               = dataGridView1.SelectedRows[0].Cells[0].Value.ToString();
            Menuitem         menuitem         = menuItemDao.GetMenuItemById(Int32.Parse(id));
            EditMenuItemForm editMenuItemForm = new EditMenuItemForm(menuitem);

            editMenuItemForm.ShowDialog();
            if (editMenuItemForm.DialogResult == DialogResult.OK)
            {
                loadData();
            }
        }