Develop Reference

Loop XML file and add to List c#

I have this XML file:
<?xml version="1.0" encoding="utf-8"?>
<ArrayOfPasswordSettings xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<PasswordSettings>
<CustomerRef>c</CustomerRef>
<Node>n</Node>
<Name>na</Name>
<Login>l</Login>
<Password>ITra+Map1RxklmcSY5yOo9wU9tUV0S4C4qwUv4p2ZFS3L8ByJYXmA9YjswlSTjQZXUJAkV3Z6mhY8OF5/dFOLNAZZRk2i2IOzrVOWSDfdpB8/Vm7PPF0ucSHILHNWpT8</Password>
<FileType>ft</FileType>
</PasswordSettings>
<PasswordSettings>
<CustomerRef>c</CustomerRef>
<Node>n</Node>
<Name>na</Name>
<Login>l</Login>
<Password>ITra+Map1RxklmcSY5yOo9wU9tUV0S4C4qwUv4p2ZFS3L8ByJYXmA9YjswlSTjQZXUJAkV3Z6mhY8OF5/dFOLNAZZRk2i2IOzrVOWSDfdpB8/Vm7PPF0ucSHILHNWpT8</Password>
<FileType>ft</FileType>
</PasswordSettings>
</ArrayOfPasswordSettings>
As you see there are multiple <PasswordSettings> which is a list of multiple items like name, login and password. Can I iterate the <PasswordSettings> in some foreach <PasswordSettings> loop and get the elements?

Please try with this example :
XML:
<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<root>
<Brand name="Brand1">
<product name="Product1" />
<product name="Product2" />
</Brand>
<Brand name="Brand2">
<product name="Product3" />
<product name="Product4" />
</Brand>
</root>
C#:
StringBuilder result = new StringBuilder();
foreach (XElement level1Element in XElement.Load(#"D:\product.xml").Elements("Brand"))
{
result.AppendLine(level1Element.Attribute("name").Value);
foreach (XElement level2Element in level1Element.Elements("product"))
{
result.AppendLine(" " + level2Element.Attribute("name").Value);
}
}

Try xml linq :
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Xml.Linq;
namespace ConsoleApplication108
{
class Program
{
const string FILENAME = #"c:\temp\test.xml";
static void Main(string[] args)
{
XDocument doc = XDocument.Load(FILENAME);
var results = doc.Descendants("PasswordSettings").Select(x => new
{
c = (string)x.Element("CustomerRef"),
node = (string)x.Element("Node"),
name = (string)x.Element("Name"),
login = (string)x.Element("Login"),
password = (string)x.Element("Password"),
fileType = (string)x.Element("FileType")
}).ToList();
}
}
}

C# delete XML node based off the inner text without knowing the parent nodes

I have a document structured such as the below, and I am trying to delete all such occurrences of "DELETE ME". There is no XPath pattern behind this. What is the best way to do this?
Original XML is below.
<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<Data>
<PageInfo>
<ID>0</ID>
<NUM>DELETE ME</NUM>
<URL>er.php</URL>
</PageInfo>
<SomeOtherAttributeName>
<ID>1</ID>
<NUM>
<INDX>DELETE ME</INDX>
<somethingElse>keep me here</somethingElse>
</NUM>
<URL>/out/out.ViewFolder.php</URL>
</SomeOtherAttributeName>
</Data>
Desired output is
<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<Data>
<PageInfo>
<ID>0</ID>
<URL>er.php</URL>
</PageInfo>
<SomeOtherAttributeName>
<ID>1</ID>
<NUM>
<somethingElse>keep me here</somethingElse>
</NUM>
<URL>/out/out.ViewFolder.php</URL>
</SomeOtherAttributeName>
</Data>

Use Xml Linq. See code below
using System;
using System.Collections.Generic;
using System.Collections;
using System.Linq;
using System.Text;
using System.Xml;
using System.Xml.Linq;
namespace ConsoleApplication75
{
class Program
{
const string FILENAME = #"c:\temp\test.xml";
static void Main(string[] args)
{
XDocument doc = XDocument.Load(FILENAME);
List<XElement> deleteMe = doc.Descendants().Where(x => (string)x == "DELETE ME").ToList();
for (int i = deleteMe.Count - 1; i >= 0; i--)
{
deleteMe[i].Remove();
}
}
}
}

Using c# to read XML that has nested namespaces

I am trying to extract the following values from this XML using C#.
Messages - the inntertext
success="true" - just the "true" bit
status="Released" - just the "Released" bit
Namespaces are clearly the issue here - but I can't get it right.
Can someone provide an example of parsing this file here please?
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/">
<soapenv:Body>
<tns:executeCreateLoanIncreaseResponse xmlns:tns="http://api.ws.liq.pisys.com/">
<CreateLoanIncreaseResponse success="true">
<OutstandingTransactionAsReturnValue version="1.0" alias="LIBRLC" status="Released" id="5CJB6GS"></OutstandingTransactionAsReturnValue>
<Messages>
<Message>CreateLoanIncrease>>Effective date current business date (08-Sep-2016).</Message>
<Message>CreateLoanIncrease>>Intent Notices have not been generated.</Message>
<Message>CreateLoanIncrease>>You are about to release this increase.</Message>
</Messages>
</CreateLoanIncreaseResponse>
</tns:executeCreateLoanIncreaseResponse>
</soapenv:Body>
</soapenv:Envelope>

Try xml linq :
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Xml.Linq;
namespace ConsoleApplication1
{
class Program
{
const string FILENAME = #"c:\temp\test.xml";
static void Main(string[] args)
{
XDocument doc = XDocument.Load(FILENAME);
XElement messages = doc.Descendants().Where(x => x.Name.LocalName == "Messages").FirstOrDefault();
XNamespace ns = messages.GetDefaultNamespace();
List<string> strMessages = messages.Elements(ns + "Message").Select(x => (string)x).ToList();
}
}
}

You can use Linq2Xml and XPath
var xDoc = XDocument.Load(filename);
var success = (bool)xDoc.XPathSelectElement("//CreateLoanIncreaseResponse").Attribute("success");
var status = (string)xDoc.XPathSelectElement("//OutstandingTransactionAsReturnValue").Attribute("status");
var messages = xDoc.XPathSelectElements("//Message").Select(x => (string)x.Value).ToList();

XSLT to convert xml into another structure

This is my response structure that i am getting
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Body>
<GetPrice_HotelResponse xmlns="PricingAirAPI">
<GetPrice_HotelResult xmlns:a="PricingHotelAPI" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<a:Error i:nil="true" />
<a:Results xmlns:b="PricingCommonAPI">
<b:HotelSearchResult>
<b:AmountAfterTax>561.9600</b:AmountAfterTax>
<b:AmountBeforeTax>561.9600</b:AmountBeforeTax>
<b:B2B2BHotelPrice xmlns:c="http://schemas.datacontract.org/2004/07/HotelB2B2BPricingEngine">
<c:AgentMarkUp>0</c:AgentMarkUp>
<c:SubAgentMarkUp>0</c:SubAgentMarkUp>
</b:B2B2BHotelPrice>
<b:BookingSource>JacTravel</b:BookingSource>
<b:CityId i:nil="true" />
<b:CityName i:nil="true" />
<b:CountryCode i:nil="true" />
<b:Currency>GBP</b:Currency>
<b:Discount>0.00</b:Discount>
<b:HotelCode>12035</b:HotelCode>
<b:HotelName i:nil="true" />
<b:HotelSupplierResultType>None</b:HotelSupplierResultType>
<b:IsUniversalApiResult>true</b:IsUniversalApiResult>
<b:Price xmlns:c="http://schemas.datacontract.org/2004/07/TekTravel.Hotel.PricingEngine">
<b:AccPriceType>NetFare</b:AccPriceType>
<b:AdditionalTxnFee>0.0</b:AdditionalTxnFee>
<b:AgentCommission>0</b:AgentCommission>
<b:AgentCommissionRate>0</b:AgentCommissionRate>
<b:AgentIncentiveAmt>0.00</b:AgentIncentiveAmt>
<b:AgentIncentiveRate>0.00</b:AgentIncentiveRate>
<b:AgentMarkUp>0</b:AgentMarkUp>
<b:AgentMarkUpAmt>0.0000</b:AgentMarkUpAmt>
<b:AgentMarkUpType>Percentage</b:AgentMarkUpType>
<b:AgentPLB>0</b:AgentPLB>
<b:AgentPLBRate>0</b:AgentPLBRate>
<b:AirlineBaggageCharges>0</b:AirlineBaggageCharges>
<b:AirlineMealCharges>0</b:AirlineMealCharges>
<b:AirlineSeatCharges>0</b:AirlineSeatCharges>
<b:AirlineTransFee>0</b:AirlineTransFee>
<b:CateringCharge>0</b:CateringCharge>
<b:CessTax>0</b:CessTax>
<b:ChargeBU />
<b:CommissionType>RB</b:CommissionType>
<b:ConvenienceCharges>0</b:ConvenienceCharges>
<b:Currency />
<b:CurrencyCode>INR</b:CurrencyCode>
<b:DealId>0</b:DealId>
<b:Discount>0</b:Discount>
<b:EduCessAmount>0</b:EduCessAmount>
<b:EduCessRate>0</b:EduCessRate>
<b:FareBreakdown i:nil="true" />
<b:IsGPEnabled>false</b:IsGPEnabled>
<b:IsOurServiceTaxOnBaseFarePlusYQ>false</b:IsOurServiceTaxOnBaseFarePlusYQ>
<b:IsOurServiceTaxOnComm>false</b:IsOurServiceTaxOnComm>
<b:IsServiceChargeApplicable>true</b:IsServiceChargeApplicable>
<b:IsServiceTaxOnBaseFarePlusYQ>false</b:IsServiceTaxOnBaseFarePlusYQ>
<b:Markup>80</b:Markup>
<b:NetFare>0</b:NetFare>
<b:OtherCharge>0</b:OtherCharge>
<b:OurCommRate>0</b:OurCommRate>
<b:OurCommission>0</b:OurCommission>
<b:OurCommissionType>RB</b:OurCommissionType>
<b:OurEduCessAmt>0</b:OurEduCessAmt>
<b:OurEduCessRate>0</b:OurEduCessRate>
<b:OurIncentiveAmt>0</b:OurIncentiveAmt>
<b:OurIncentiveRate>0</b:OurIncentiveRate>
<b:OurPLB>0</b:OurPLB>
<b:OurPLBRate>0</b:OurPLBRate>
<b:OurPlbType i:nil="true" />
<b:OurServiceTaxAmt>0</b:OurServiceTaxAmt>
<b:OurServiceTaxRate>0</b:OurServiceTaxRate>
<b:OurTdsCommAmt>0</b:OurTdsCommAmt>
<b:OurTdsIncentiveAmt>0.0</b:OurTdsIncentiveAmt>
<b:OurTdsPLBAmt>0</b:OurTdsPLBAmt>
<b:OurTdsRate>0</b:OurTdsRate>
<b:PlbType i:nil="true" />
<b:PrfCurrency i:nil="true" />
<b:PrfROE>0.0</b:PrfROE>
<b:PriceId>0</b:PriceId>
<b:PublishedFare>0</b:PublishedFare>
<b:RateOfExchange>1</b:RateOfExchange>
<b:ResultId>0</b:ResultId>
<b:ReverseHandlingCharge>0</b:ReverseHandlingCharge>
<b:SegmentFee>0</b:SegmentFee>
<b:ServiceTaxRate>0</b:ServiceTaxRate>
<b:SeviceTax>0</b:SeviceTax>
<b:StockType />
<b:SupplierId>0</b:SupplierId>
<b:TDSPLB>0</b:TDSPLB>
<b:Tax>0</b:Tax>
<b:TaxBreakup i:nil="true" xmlns:d="http://schemas.datacontract.org/2004/07/System.Collections.Generic" />
<b:TdsCommission>0</b:TdsCommission>
<b:TdsIncentive>0.00</b:TdsIncentive>
<b:TdsRate>0</b:TdsRate>
<b:TotalGP>0</b:TotalGP>
<b:TransactionFee>0</b:TransactionFee>
<b:WLCharge>0</b:WLCharge>
<b:WLPrice i:nil="true" />
<b:WhiteLabelDiscount>0</b:WhiteLabelDiscount>
<b:YQTax>0</b:YQTax>
<c:DynamicPriceAgentComm>0</c:DynamicPriceAgentComm>
<c:DynamicPriceOurComm>0</c:DynamicPriceOurComm>
</b:Price>
<b:RateType>Negotiated</b:RateType>
<b:RoomDetails />
<b:TotalGP>0</b:TotalGP>
</b:HotelSearchResult>
<b:HotelSearchResult>
.....
</b:HotelSearchResult>
</a:Results>
<a:Status>Successful</a:Status>
<a:TraceId>b748e818-5c6a-4e41-94ca-f8552a328b99</a:TraceId>
</GetPrice_HotelResult>
</GetPrice_HotelResponse>
</s:Body>
</s:Envelope>
Now I want to create xml like
<?xml version="1.0" encoding="utf-16"?>
<ArrayOfHotelSearchResult xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<HotelSearchResult>
<ResultIndex>1</ResultIndex>
<HotelCode>AMB3|LON</HotelCode>
<HotelName>Ambassadors Bloomsbury</HotelName>
<HotelCategory />
<StarRating>FourStar</StarRating>
<HotelDescription>***Special Offer Free welcome gift for stays of 4 or more nights and free bottle of water in each room </HotelDescription>
<HotelPromotion />
<HotelPolicy />
<HotelPicture>http://images.gta-travel.com/HH/Images/GB/LON/LON-AMB3-1.jpg</HotelPicture>
<HotelAddress>12 UPPER WOBURN PLACE London WC1 0HX United Kingdom, , United Kingdom, </HotelAddress>
<HotelContactNo />
<Latitude />
<Longitude />
<AmountBeforeTax>0</AmountBeforeTax>
<AmountAfterTax>0</AmountAfterTax>
<AmountBeforeDiscount>0</AmountBeforeDiscount>
<AmountBeforeTaxInSupplierCurr>259.00</AmountBeforeTaxInSupplierCurr>
<AmountAfterTaxInSupplierCurr>259.00</AmountAfterTaxInSupplierCurr>
<AmountBeforeDiscountInSupplierCurr>259.00</AmountBeforeDiscountInSupplierCurr>
<BookingSource>GTA</BookingSource>
<CurrencySupplier>GBP</CurrencySupplier>
<PreferredROE>0</PreferredROE>
<IsBaseCurrencyRequired>false</IsBaseCurrencyRequired>
<Price>
<CommissionType>RB</CommissionType>
<PlbType>RB</PlbType>
<OurPlbType>RB</OurPlbType>
<AirlineTransFee>0</AirlineTransFee>
<TdsCommission>0</TdsCommission>
<TDSPLB>0</TDSPLB>
<PriceId>0</PriceId>
<PublishedFare>0</PublishedFare>
<NetFare>0</NetFare>
<Markup>0</Markup>
<ServiceTax>0</ServiceTax>
<CessTax>0</CessTax>
<OurCommission>0</OurCommission>
<OurPLB>0</OurPLB>
<AgentCommission>0</AgentCommission>
<AgentPLB>0</AgentPLB>
<OtherCharges>0</OtherCharges>
<Tax>0</Tax>
<WhiteLabelDiscount>0</WhiteLabelDiscount>
<TransactionFee>0</TransactionFee>
<Currency>INR</Currency>
<ChargeBU />
<AccPriceType>PublishedFare</AccPriceType>
<RateOfExchange>0</RateOfExchange>
<AdditionalTxnFee>0</AdditionalTxnFee>
<WLCharge>0</WLCharge>
<Discount>0</Discount>
<ReverseHandlingCharge>0</ReverseHandlingCharge>
<YQTax>0</YQTax>
<IsServiceTaxOnBaseFarePlusYQ>false</IsServiceTaxOnBaseFarePlusYQ>
<TdsRate>0</TdsRate>
<AgentMarkUpType>Percentage</AgentMarkUpType>
<AgentMarkUp>0</AgentMarkUp>
<AgentMarkUpAmt>0</AgentMarkUpAmt>
<ConvenienceCharges>0</ConvenienceCharges>
<PrfROE>0</PrfROE>
<ServiceTaxRate>0</ServiceTaxRate>
<EduCessRate>0</EduCessRate>
<EduCessAmount>0</EduCessAmount>
<AgentCommissionRate>0</AgentCommissionRate>
<AgentPLBRate>0</AgentPLBRate>
<AirlineBaggageCharges>0</AirlineBaggageCharges>
<AirlineMealCharges>0</AirlineMealCharges>
<AirlineSeatCharges>0</AirlineSeatCharges>
<OurCommRate>0</OurCommRate>
<OurPLBRate>0</OurPLBRate>
<OurIncentiveRate>0</OurIncentiveRate>
<OurIncentiveAmt>0</OurIncentiveAmt>
<SegmentFee>0</SegmentFee>
<OurCommissionType>RB</OurCommissionType>
<OurServiceTaxRate>0</OurServiceTaxRate>
<OurServiceTaxAmt>0</OurServiceTaxAmt>
<OurEduCessRate>0</OurEduCessRate>
<OurEduCessAmt>0</OurEduCessAmt>
<OurTdsRate>0</OurTdsRate>
<IsServiceChargeApplicable>true</IsServiceChargeApplicable>
<OurTdsCommAmt>0</OurTdsCommAmt>
<OurTdsPLBAmt>0</OurTdsPLBAmt>
<IsGPEnabled>false</IsGPEnabled>
<TotalGP>0</TotalGP>
<CateringCharge>0</CateringCharge>
<AgentIncentiveRate>0.00</AgentIncentiveRate>
<AgentIncentiveAmt>0.00</AgentIncentiveAmt>
<TdsIncentive>0.00</TdsIncentive>
<DealId>0</DealId>
<SupplierId>0</SupplierId>
<StockType />
<IsPaidByAgentCreditCard>false</IsPaidByAgentCreditCard>
<AmountPaidByAgentCreditCard>0.00</AmountPaidByAgentCreditCard>
<OurTdsIncentiveAmt>0.00</OurTdsIncentiveAmt>
<IsOurServiceTaxOnComm>false</IsOurServiceTaxOnComm>
<IsOurServiceTaxOnBaseFarePlusYQ>false</IsOurServiceTaxOnBaseFarePlusYQ>
<ServiceFee>0</ServiceFee>
<TotalTxnFee>0</TotalTxnFee>
<SwachhBharatCessRate>0</SwachhBharatCessRate>
<SwachhBharatCessAmount>0</SwachhBharatCessAmount>
</Price>
<RateType>Negotiated</RateType>
<CityName />
<IsDomestic>false</IsDomestic>
<NoOfRooms>0</NoOfRooms>
<NoOfNights>0</NoOfNights>
<IsTBOMapped>false</IsTBOMapped>
<SupplierHotelCodes />
<UAPISessionId>7685eeea-c903-4eb7-ae76-2369f40b635c</UAPISessionId>
<HotelDetails>
<StarRating>All</StarRating>
</HotelDetails>
<BookingMode>NotSet</BookingMode>
</HotelSearchResult>
<HotelSearchResult>
.......
</HotelSearchResult>
</ArrayOfHotelSearchResult>
Can anybody help me in making xslt. Currently I an unable to get any value in xslt and i am also facing problem in debugging in VS2012. Sometimes debugger comes sometimes not.

Here is a start using xml linq
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Xml.Linq;
namespace ConsoleApplication93
{
class Program
{
const string XML_INPUT = #"c:\temp\test.xml";
static void Main(string[] args)
{
XDocument inputDoc = XDocument.Load(XML_INPUT);
List<XElement> hotelSearchResults = inputDoc.Descendants().Where(x => x.Name.LocalName == "HotelSearchResult").ToList();
XNamespace aNS = hotelSearchResults[0].GetNamespaceOfPrefix("a");
XNamespace bNS = hotelSearchResults[0].GetNamespaceOfPrefix("b");
string header = "<?xml version=\"1.0\" encoding=\"utf-16\"?>" +
"<ArrayOfHotelSearchResult xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\">" +
"</ArrayOfHotelSearchResult>";
XDocument doc = XDocument.Parse(header);
XElement arrayOfHotelSearchResult = (XElement)doc.FirstNode;
int count = 0;
foreach (XElement hotelSearchResult in hotelSearchResults)
{
XElement newHotel = new XElement("HotelSearchResult");
arrayOfHotelSearchResult.Add(newHotel);
newHotel.Add(new object[] {
new XElement("ResultIndex", ++count),
new XElement("HotelCode", (string)hotelSearchResult.Descendants(bNS + "HotelCode").FirstOrDefault())
});
XElement price = new XElement("Price");
newHotel.Add(price);
price.Add(new XElement("CommissionType", (string)hotelSearchResult.Descendants(bNS + "CommissionType").FirstOrDefault()));
}
}
}
}
Using XmlReader
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Xml.Linq;
namespace ConsoleApplication93
{
class Program
{
const string XML_INPUT = #"c:\temp\test.xml";
static void Main(string[] args)
{
XmlReader reader = XmlReader.Create(XML_INPUT);
XNamespace bNS = "PricingCommonAPI";
while(!reader.EOF)
{
if(reader.Name != "HotelSearchResult")
{
reader.ReadToFollowing("HotelSearchResult", bNS.NamespaceName);
}
if(!reader.EOF)
{
XElement hotelSearchResult = (XElement)XElement.ReadFrom(reader);
}
}
}
}
}

XSLT is a type of stylesheet primarily used to present the data from XML in a human-readable way, usually by putting it into HTML elements.
If you want to convert your existing XML to a new structure, I suggest you use XML tools in C# to deserialize the XML, map it to the new structure and render a new XML.

Getting "<kml:..." everywhere, updating a Kml file

I'm reading in a Kml file, changing the placemarks' names, and saving it again.
var KmlFile = XDocument.Load("C:\\Inetpub\\wwwroot\\GeotagService\\Kml\\Photographs.kml");
XNamespace KmlNamespace = "http://www.opengis.net/kml/2.2";
// find the Placemarks in the Photos folder
IEnumerable<XElement> Placemarks = KmlFile.Element(KmlNamespace + "kml").Element(KmlNamespace + "Document").Element(KmlNamespace + "Folder").Elements(KmlNamespace + "Placemark");
foreach (XElement p in Placemarks){
p.Element(KmlNamespace + "name").Value = "testing";
}
KmlFile.Save("C:\\Inetpub\\wwwroot\\GeotagService\\Kml\\Photographs.kml");
When I save it however, every element is prefixed with <kml:, like this:
<kml:Folder>
<kml:name>Photos</kml:name>
<kml:open>1</kml:open>
<kml:Placemark>
<kml:name>testing</kml:name>
<kml:LookAt>
<kml:longitude>-10.02717694938161</kml:longitude>
<kml:latitude>53.48672543547379</kml:latitude>
<kml:altitude>0</kml:altitude>
</kml:LookAt>
<kml:styleUrl>#msn_ylw-pushpin1</kml:styleUrl>
<kml:Point>
<kml:coordinates>-10.02867619360582,53.48651240326751,0</kml:coordinates>
</kml:Point>
</kml:Placemark>...
Tomalak's comment on this question about blank xmlns gives me a clue that it might be inconsistencies between the namespaces of the document and the elements, but I can't see how I'm doing that. Anyone know?
EDIT: Original document (in part):
<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://www.opengis.net/kml/2.2" xmlns:gx="http://www.google.com/kml/ext/2.2" xmlns:kml="http://www.opengis.net/kml/2.2" xmlns:atom="http://www.w3.org/2005/Atom">
<Document>
<name>Connemara.net Photographs</name>
<open>1</open>
<Style id="sh_ylw-pushpin0">
<IconStyle>
<scale>1.3</scale>
<Icon>
<href>http://maps.google.com/mapfiles/kml/pushpin/ylw-pushpin.png</href>
</Icon>
<hotSpot x="20" y="2" xunits="pixels" yunits="pixels"/>
</IconStyle>
</Style>
<Folder>
<name>Photos</name>
<open>1</open>
<Placemark>
<name>Id:579</name>
<LookAt>
<longitude>-10.02717694938161</longitude>
<latitude>53.48672543547379</latitude>
<altitude>0</altitude>
<range>213.2931913230747</range>
<tilt>75.17546328115256</tilt>
<heading>69.89736514305363</heading>
<altitudeMode>relativeToGround</altitudeMode>
<gx:altitudeMode>relativeToSeaFloor</gx:altitudeMode>
</LookAt>
<styleUrl>#msn_ylw-pushpin1</styleUrl>
<Point>
<coordinates>-10.02867619360582,53.48651240326751,0</coordinates>
</Point>
</Placemark>
...
</Folder>
</Document>
</kml>

Got it - the problem is that the original document starts like this:
<kml xmlns="http://www.opengis.net/kml/2.2"
xmlns:gx="http://www.google.com/kml/ext/2.2"
xmlns:kml="http://www.opengis.net/kml/2.2"
xmlns:atom="http://www.w3.org/2005/Atom">
LINQ to XML sees that there's a specific alias for the KML namespace, so uses that. If you remove that attribute, it works fine:
var explicitNs = KmlFile.Root.Attribute(XNamespace.Xmlns + "kml");
if (explicitNs != null)
{
explicitNs.Remove();
}

You need to use a namespace manager. Here's an example using XPath to select the necessary tags and then update their value:
using System;
using System.Xml;
using System.Xml.Linq;
using System.Xml.XPath;
class Program
{
static void Main(string[] args)
{
var kml = XDocument.Load("test.kml");
var ns = new XmlNamespaceManager(new NameTable());
ns.AddNamespace("kml", "http://www.opengis.net/kml/2.2");
var names = kml.XPathSelectElements("//kml:Placemark/kml:name", ns);
foreach (var name in names)
{
name.Value = "testing";
}
kml.Save("test.kml");
}
}