private void btnDelete_ItemClick(object sender, ItemClickEventArgs e)
 {
     try
     {
         if (HeaderView.FocusedRowHandle >= 0)
         {
             lines.DeleteMulti(lines.GetAll().Where(l => l.transCode == TransCode));
             header.Delete(header.Get(TransCode));
             HeaderView.DeleteRow(HeaderView.FocusedRowHandle);
         }
     }
     catch (Exception ex)
     {
         MessageBox.Show(ex.Message);
     }
 }