how to connect to microsoft dynamics ax 2012 WCF Currency services using a create request

gistfile1.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using CurrencyServiceExample.DAX.Services;

namespace CurrencyServiceExample
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                //This will CREATE a new PAIR OF EXCHANGE rates
                ExchangeRateServiceCreateRequest request = new ExchangeRateServiceCreateRequest();
                ExchangeRateServiceClient client = new ExchangeRateServiceClient();

                request.CallContext = new CallContext();
                request.CallContext.Language = "en-us";
                request.CallContext.Company = "TST";
                request.CallContext.MessageId = Guid.NewGuid().ToString();

                AxdEntity_CurrencyPair[] pair = new AxdEntity_CurrencyPair[1];
                pair[0] = new AxdEntity_CurrencyPair();
                pair[0].FromCurrencyCode = "CAD";
                pair[0].ToCurrencyCode = "BRL";

                AxdEntity_ExchangeRate[] exchRates = new AxdEntity_ExchangeRate[1];
                exchRates[0] = new AxdEntity_ExchangeRate();
                exchRates[0].ExchangeRate = new Decimal(1.61);
                exchRates[0].ExchangeRateSpecified = true;

                pair[0].ExchangeRate = exchRates;
                pair[0].ExchangeRateDisplayFactor = AxdEnum_ExchangeRateDisplayFactor.Hundred;
                pair[0].ExchangeRateType = "Average";

                AxdType_DateTime dateTimeValidFrom = new AxdType_DateTime();

                //here you can specify current timezone and localtime
                dateTimeValidFrom.localDateTime = DateTime.Now.ToUniversalTime();
                //dateTimeValidFrom.localDateTimeSpecified = true;
                dateTimeValidFrom.timezone = AxdEnum_Timezone.GMTMINUS0500EASTERNTIME;
                dateTimeValidFrom.Value = dateTimeValidFrom.localDateTime;

                AxdType_DateTime dateTimeValidTo = new AxdType_DateTime();

                dateTimeValidTo.localDateTime = DateTime.Now.AddDays(2).ToUniversalTime();
                //dateTimeValidFrom.localDateTimeSpecified = true;
                dateTimeValidTo.timezone = AxdEnum_Timezone.GMTMINUS0500EASTERNTIME;
                dateTimeValidTo.Value = dateTimeValidFrom.localDateTime;

                request.LedgerExchangeRate = new AxdLedgerExchangeRate();
                request.LedgerExchangeRate.CurrencyPair = pair;
                request.LedgerExchangeRate.ValidFromDateTime = dateTimeValidFrom;
                request.LedgerExchangeRate.ValidToDateTime = dateTimeValidTo;

                client.Open();
                client.create(request.CallContext, request.LedgerExchangeRate);
                client.Close();

                Console.Write("Operation succeeded!");
            }
            catch (Exception exception)
            {
                Console.Write(exception.Message);
            }
        }
    }
}