Use of unassigned local variable in c# mvc

I have one functionality where i am having three modes based on that modes i am displaying my database records in my view for that i am using following code but i am getting following error

Use of unassigned local variable 'result'

this is my controller code

    public PartialViewResult _LaundryBookingPart(DateTime? From, DateTime? To, int mode)
    {
        List<RoomLaundryvw> result;
        if (mode == (int)ItemTypesEnum.LaundryGuest)
        {
            result = db.Query<RoomLaundryvw>($"Select rm.RoomID,rm.RoomNo,g.GuestID,g.GuestName,ln.LaundryID,it.ItemName,ln.PickDate,ln.ServiceKind,ln.DropQty,ln.DropDate from Laundry ln " +
            "inner join Items it on ln.ItemId = it.ItemId " +
            "inner join Rooms rm on ln.RoomID = rm.RoomID " +
            "left join Reservation_Guest rg on rg.ReservationID = ln.ReservationID " +
            $"left join Guests g on g.GuestID = rg.GuestID").ToList();
        }

        if (mode == (int)ItemTypesEnum.LaundryStaff)
        {
            result = db.Query<RoomLaundryvw>("Select au.RealName as GuestName from Laundry ln INNER JOIN AspNetUsers au ON ln.UserId = au.Id").ToList();
        }

        if (mode == (int)ItemTypesEnum.Linen)
        {
            result = db.Query<RoomLaundryvw>("Select rm.RoomID,rm.RoomNo,g.GuestID,it.ItemName,g.GuestName from Laundry ln " +
                     "inner join Items it on ln.ItemId = it.ItemId " +
                     "inner join Rooms rm on ln.RoomID = rm.RoomID " +
                     "left join Reservation_Guest rg on rg.ReservationID = ln.ReservationID " +
                     "left join Guests g on g.GuestID = rg.GuestID ").ToList();
        }
        return PartialView(result);
    }

i am getting red line with above error

Please help me with this