public void LoadData()
        {
            FilterEntity filterEntity = new FilterEntity();

            if (rdoAllDays.Checked)
            {
                filterEntity.FromDate = null;
                filterEntity.ToDate   = null;
            }
            else if (rdoByDate.Checked)
            {
                filterEntity.FromDate = dtpFrom.Value;
                filterEntity.ToDate   = dtpTo.Value;
            }
            filterEntity.Keyword = txtKeyword.Text;
            gridList.DataSource  = CategoryDao.FilterListCategory(filterEntity);
            gridList.Refresh();
        }