protected void btnTim_Click(object sender, EventArgs e) { string doituong = ddlDoiTuong.SelectedIndex.ToString(); string loaiphong = ddlLoaiPhong.SelectedValue.ToString().Trim(); string sn = ddlSoNguoi.SelectedValue.ToString().Trim(); LoadAll(xl.SearchRoom(doituong, loaiphong, sn)); }