using System;

using System.Xml.Linq;

​

public class Program

{

    public static void Main()

    {

        var str =

            @"

<CustomerCareReport xmlns='http://schemas.datacontract.org/2004/07/Foo.Bar.Frameworks.Reporting.Stack.Infrastructure.DataObjects.FireEms' xmlns:i='http://www.w3.org/2001/XMLSchema-instance'>

  <RecordAction xmlns='http://schemas.datacontract.org/2004/07/Foo.Bar.Frameworks.Reporting.Stack.Infrastructure.DataObjects'>Edit</RecordAction>

  <FireIncident xmlns:a='http://schemas.datacontract.org/2004/07/Foo.Bar.Frameworks.Reporting.Stack.Infrastructure.DataObjects.FireIncidents'>

    <a:Address xmlns:b='http://schemas.datacontract.org/2004/07/Foo.Bar.Frameworks.Reporting.Stack.Infrastructure.DataObjects.Addresses'>

      <b:City>SomeCity</b:City>

      <b:HouseNumber>4019</b:HouseNumber>

      <b:Id>1651880</b:Id>

      <b:Lat>47.573911198</b:Lat>

      <b:LocationType>Address</b:LocationType>

      <b:Lon>-122.169529554</b:Lon>

      <b:State xmlns:c='http://schemas.datacontract.org/2004/07/Foo.Bar.Frameworks.Reporting.Stack.Infrastructure.DataObjects.ValidationSets'>

        <RecordAction xmlns='http://schemas.datacontract.org/2004/07/Foo.Bar.Frameworks.Reporting.Stack.Infrastructure.DataObjects'>Relate</RecordAction>

        <c:Description>Washington</c:Description>

        <c:EntryValue>WA</c:EntryValue>

        <c:FilterString>WA Washington</c:FilterString>

        <c:Id>85</c:Id>

        <c:Inactive>false</c:Inactive>

        <c:SetId>1021</c:SetId>

      </b:State>

      <b:StreetName>FACTORIA</b:StreetName>

      <b:StreetSuffix>SE</b:StreetSuffix>

      <b:StreetType>BLVD</b:StreetType>

      <b:Venue>

        <b:VenueName>BE</b:VenueName>

      </b:Venue>

      <b:VenueName>BE</b:VenueName>

      <b:Zip>98006</b:Zip>

    </a:Address>

    <a:FDID xmlns:b='http://schemas.datacontract.org/2004/07/Foo.Bar.Frameworks.Reporting.Stack.Infrastructure.DataObjects.Jurisdictions'>

      <RecordAction xmlns='http://schemas.datacontract.org/2004/07/Foo.Bar.Frameworks.Reporting.Stack.Infrastructure.DataObjects'>Relate</RecordAction>

      <b:Ori>17M02</b:Ori>

    </a:FDID>

    <a:IncidentNumber>2016-00000071</a:IncidentNumber>

  </FireIncident>

  <OtherInformation>

    <RecordAction xmlns='http://schemas.datacontract.org/2004/07/Foo.Bar.Frameworks.Reporting.Stack.Infrastructure.DataObjects'>Add</RecordAction>

    <Documents xmlns:a='http://schemas.datacontract.org/2004/07/Foo.Bar.Frameworks.Reporting.Stack.Infrastructure.DataObjects.Documents'>

      <a:Document>

        <RecordAction xmlns='http://schemas.datacontract.org/2004/07/Foo.Bar.Frameworks.Reporting.Stack.Infrastructure.DataObjects'>Add</RecordAction>

        <a:CheckOutMachine>TROPPLT</a:CheckOutMachine>

        <a:Contents>Z2dn</a:Contents>

        <a:Description>yoyo</a:Description>

        <a:FileType xmlns:b='http://schemas.datacontract.org/2004/07/Foo.Bar.Frameworks.Reporting.Stack.Infrastructure.DataObjects.ValidationSets'>

          <RecordAction xmlns='http://schemas.datacontract.org/2004/07/Foo.Bar.Frameworks.Reporting.Stack.Infrastructure.DataObjects'>Relate</RecordAction>

          <b:Description>Notepad</b:Description>

          <b:EntryValue>txt</b:EntryValue>

          <b:FilterString>txt Notepad</b:FilterString>

          <b:Id>1</b:Id>

          <b:Inactive>false</b:Inactive>

          <b:SetId>2574</b:SetId>

        </a:FileType>

        <a:Id>0e2821b0-9430-40a8-8964-443cdeeda018</a:Id>

        <a:Name>yoyo</a:Name>

        <a:UsageKey>0</a:UsageKey>

        <a:UsageType>56</a:UsageType>

      </a:Document>

      <a:Document>

        <RecordAction xmlns='http://schemas.datacontract.org/2004/07/Foo.Bar.Frameworks.Reporting.Stack.Infrastructure.DataObjects'>Add</RecordAction>

        <a:CheckOutMachine>TROPPLTBKOLLURU</a:CheckOutMachine>

        <a:Contents>ZmhmaA0KZmZmDQpmamZqZmpmDQo=</a:Contents>

        <a:Description>test 2</a:Description>

        <a:FileType xmlns:b='http://schemas.datacontract.org/2004/07/Foo.Bar.Frameworks.Reporting.Stack.Infrastructure.DataObjects.ValidationSets'>

          <RecordAction xmlns='http://schemas.datacontract.org/2004/07/Foo.Bar.Frameworks.Reporting.Stack.Infrastructure.DataObjects'>Relate</RecordAction>

          <b:Description>Notepad</b:Description>

          <b:EntryValue>txt</b:EntryValue>

          <b:FilterString>txt Notepad</b:FilterString>

          <b:Id>1</b:Id>

          <b:Inactive>false</b:Inactive>

          <b:SetId>2574</b:SetId>

        </a:FileType>

        <a:Id>9b42f7e0-e0b3-4e83-a466-5862e9cb5bbe</a:Id>

        <a:Name>test 2</a:Name>

        <a:UsageKey>0</a:UsageKey>

        <a:UsageType>56</a:UsageType>

      </a:Document>

    </Documents>

  </OtherInformation>

  <Response>

    <Apparatus xmlns:a='http://schemas.datacontract.org/2004/07/Foo.Bar.Frameworks.Reporting.Stack.Infrastructure.DataObjects.Units'>

      <RecordAction xmlns='http://schemas.datacontract.org/2004/07/Foo.Bar.Frameworks.Reporting.Stack.Infrastructure.DataObjects'>Relate</RecordAction>

      <a:Id>-1672</a:Id>

      <a:UnitNumber>E1</a:UnitNumber>

    </Apparatus>

    <ResponseNumber>1600000071E1</ResponseNumber>

  </Response>

  <Time>

    <CallDatetime>2016-07-01T12:26:34.277-04:00</CallDatetime>

    <DispatchNotifiedDatetime>2016-07-01T12:26:34.277-04:00</DispatchNotifiedDatetime>

  </Time>

</CustomerCareReport>";

​

        XNamespace ns =

            "http://schemas.datacontract.org/2004/07/Foo.Bar.Frameworks.Reporting.Stack.Infrastructure.DataObjects.FireEms";

        XNamespace a =

            "http://schemas.datacontract.org/2004/07/Foo.Bar.Frameworks.Reporting.Stack.Infrastructure.DataObjects.Documents";

​

        var element = XElement.Parse(str);

​

        var ids = element

            .Descendants(ns + "Documents")

            .Descendants(a + "Id");

​

        foreach (XElement id in ids)

        {

            Console.WriteLine(id.Value);

        }

    }

}

​