private void config_Remove()
        {
            int index = list_TextFirst.SelectedIndex == -1 ? list_TextLast.SelectedIndex : list_TextFirst.SelectedIndex;

            if (index == -1)
            {
                MessageBox.Show("Please choose on list box text to remove it");
                return;
            }

            if (MessageBox.Show("You will remove config choose ?", "Are you sure ?",
                                MessageBoxButtons.YesNo, MessageBoxIcon.Exclamation,
                                MessageBoxDefaultButton.Button2) == System.Windows.Forms.DialogResult.Yes)
            {
                long id = ((long)(list_TextFirst.Items[index] as ComboboxItem).Value);

                bool val = db.RemoveItemByKeyFieldSyncEdit(typeof(CNSPLIT).Name, id);
                if (val)
                {
                    list_TextFirst.Items.RemoveAt(index);
                    list_TextLast.Items.RemoveAt(index);
                    //txt_TextFirst.Reset();
                    //txt_TextLast.Reset();
                }
                else
                {
                    MessageBox.Show("Remove object fail");
                }
            }
        }