// DELETE api/values/5
        public bool Delete(int ID)
        {
            try
            {
                using (Smart_ParkingEntities1 context = new Smart_ParkingEntities1())
                {
                    //ParkingSlotMaster OneSlot = (from slot in context.ParkingSlotMasters
                    //                             where slot.ID == ID
                    //                             select slot).FirstOrDefault();

                    //context.ParkingSlotMasters.Attach(OneSlot);
                    //context.ParkingSlotMasters.Remove(OneSlot);
                    //context.SaveChanges();
                    //return true;
                    ParkingSlotMaster OneSlot = new ParkingSlotMaster { ID = ID };
                    context.Entry(OneSlot).State = System.Data.EntityState.Deleted;
                    context.SaveChanges();
                    return true;
                }
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
                return false;
            }
            //delete
        }