public async Task <SelectedNumberDto> GetSelectedNumber(int id)
        {
            using (CellularCompanyContext db = new CellularCompanyContext())
            {
                SelectedNumbers selectedNumber = await db.SelectedNumbers.FindAsync(id);

                return(selectedNumber.ToDto());
            }
        }
        public async Task <SelectedNumberDto> DeleteSelectedNumber(int id)
        {
            using (CellularCompanyContext db = new CellularCompanyContext())
            {
                SelectedNumbers selectedNumber = await db.SelectedNumbers.FindAsync(id);

                if (selectedNumber == null)
                {
                    return(null);
                }
                else
                {
                    db.SelectedNumbers.Remove(selectedNumber);
                    await db.SaveChangesAsync();

                    return(selectedNumber.ToDto());
                }
            }
        }