private async Task <bool> FillPersonIdToState(ConcurrentDictionary <string, string> personIdToSateDic, List <Bill> bills, int[] rangeInfo)
{
foreach (Bill bill in bills.GetRange(rangeInfo[0], rangeInfo[1]))
{
Customer customer = await _customerApiService.GetCustomerAsync(bill.PersonId);
string state = (customer == null ? STATE_FOR_NOT_REGISTERED_CUSTOMER : customer.State);
personIdToSateDic.TryAdd(bill.PersonId, state);
}
return(true);
}