public String Save(ClassRoom room)
        {
            if (room.StartTime > room.Endtime)
            {
                return("Time is Unvaluable.. Try Agein..!");
            }
            bool isTimeScheduleValid = IsTimeScheduleValid(room.RoomId, room.DayId, room.StartTime, room.Endtime);

            if (isTimeScheduleValid != true)
            {
                if (classRoomGateway.Insert(room) > 0)
                {
                    return("Saved Sucessfully!");
                }
                return("Failed to save");
            }
            return("Overlapping not allowed");
        }