private DataTable GetRoomTypes(int roomTypeId)
    {
        DataTable table    = null;
        RoomTypes roomType = new RoomTypes();

        if (roomTypeId == 0)
        {
            table = roomType.SelectAll();
        }
        else
        {
            roomType.RoomType_ID = roomTypeId;
            table = roomType.SelectOne();
        }
        return(table);
    }
    private void BindGridView(int roomTypeId)
    {
        DataTable table    = null;
        RoomTypes roomType = new RoomTypes();

        if (roomTypeId == 0)
        {
            table = roomType.SelectAll();
        }
        else
        {
            roomType.RoomType_ID = roomTypeId;
            table = roomType.SelectOne();
        }

        grid.DataSource = table;
        grid.DataBind();
    }