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(); }