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); }