private void AddJournal()
{
Enum.TryParse(comboCategory.Text, out eCategory category);
Journal item = new Journal(txtVolume.Text, Int32.Parse(txtIsbn.Text), txtItemName.Text, DateTime.Parse(dateTime.Text),
Convert.ToDouble(txtPrice.Text), Int32.Parse(txtCopyNumber.Text), txtTopic.Text, category, Convert.ToInt32(nUDStock.Value));
bs.AddJournal(item);
}
