public void BindGV()
{
string sort = "id";
string order = "DESC";
int currentPage = Pager.CurrentPageIndex;
IList <Model.room_type> list = fmtype.GetBookRoomPager(sort, order, currentPage, pageSize, " where 1=1");
GrdCostRoom.DataSource = list;
GrdCostRoom.DataBind();
}