using System;

using System.Collections.Generic;

using System.Linq;

using System.Globalization;

using System.Xml.Linq;

using System.Xml;

public class Program

{

    public static void Main()

    {

        var doc = XDocument.Parse(@"<StateList>

    <State>

      <SourceJobID>J999999999999</SourceJobID>

      <TargetJobState>Complete</TargetJobState>

      <TargetJobID>11111111</TargetJobID>

      <TargetSystem>TESTSYSTEM</TargetSystem>

      <VehicleDetails>

        <Registration>TESTREGISRATION</Registration>

        <Plate>11111111111</Plate>

        <CO2Rating>160</CO2Rating>

        <Badge>1111111</Badge>

        <Description>TEST DESCRIPTION</Description>

      </VehicleDetails>

      <CompleteDetails>

        <CompletedOn>2015-09-15T13:39:11+01:00</CompletedOn>

        <JobDistance>0</JobDistance>

        <WaitingTime />

        <CO2Usage>0</CO2Usage>

        <ChargeList>

          <Charge>

            <Name>Airport Pickup</Name>

            <Currency>GBP</Currency>

            <Price>0.00</Price>

          </Charge>

          <Charge>

            <Name>Fare</Name>

            <Currency>GBP</Currency>

            <Price>25.00</Price>

          </Charge>

          <Charge>

            <Name>Extra Stops</Name>

            <Currency>GBP</Currency>

            <Price>10.00</Price>

          </Charge>

        </ChargeList>

      </CompleteDetails>

    </State></StateList>");

    if(doc.Descendants("Charge").Any())

    {

    var FarePrice = doc.Descendants("Charge")

                    .Where(x => x.Descendants("Name").First().Value.Equals("Fare")).First().Element("Price").Value;

    var Sum = doc.Descendants("Charge")

                    .Select(x => Convert.ToDouble(x.Descendants("Price").First().Value))

                    .Sum();     

        Console.WriteLine("Fare price:{0} Sum:{1}",FarePrice,Sum);

    }

​

    }

}