private void btLoadRoom_Click(object sender, EventArgs e) { if (txtSearchRoom.Text == "") { this.loadData(); } else { string Key = txtSearchRoom.Text.Trim(); if (Key == null || Key == string.Empty || Key.Length == 0) { List <RoomDTO> listTimKiem = rmBus.select(); this.loadData(listTimKiem); } else { List <RoomDTO> listTimKiem = rmBus.search(Key); this.loadData(listTimKiem); } } }