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Change XML element value in c#

My C# code:
XDocument doc = XDocument.Load(filename);
IEnumerable<XElement> collection =
doc.Elements("BCIRequest").Elements("Card").Elements("SelectedPIN");
My XML document:
<?xml version="1.0" encoding="utf-8"?>
<BCIRequest Version="2.0"
xmlns="urn:xxxxxx:bci:request">
<Header>
<SenderCode>XX99</SenderCode>
<SenderID>9999</SenderID>
<SequenceNumber>123</SequenceNumber>
<CardGroupCount>2</CardGroupCount>
<CardCount>4</CardCount>
<BlockCount>2</BlockCount>
</Header>
<!--card groups (must precede cards and blocks)-->
<CardGroup RequestID="1">
<CustomerNumber>XX01234567</CustomerNumber>
<CardGroupName Emboss="true">GROUP ONE</CardGroupName>
</CardGroup>
<CardGroup RequestID="2"
RequestRef="87416CB7-DAEF-483A-BD08-1A885531D958">
<CustomerNumber>XX12345678</CustomerNumber>
<CardGroupName Emboss="false">GROUP TWO</CardGroupName>
</CardGroup>
<Card RequestID="3">
<CustomerNumber>XX01234567</CustomerNumber>
<DriverCard>
<Driver Emboss="true">MARGE SIMPSON</Driver>
</DriverCard>
<CardTypeID>10</CardTypeID>
<PurchaseCategoryID>11</PurchaseCategoryID>
<Reissue>false</Reissue>
<GeneratedPIN/>
<OdoPrompt>false</OdoPrompt>
<CRNPrompt>false</CRNPrompt>
</Card>
<Card RequestID="4">
<CustomerNumber>XX12345678</CustomerNumber>
<VehicleCard>
<VRN Emboss="true">KYI 830</VRN>
</VehicleCard>
<CardTypeID>10</CardTypeID>
<PurchaseCategoryID>11</PurchaseCategoryID>
<Reissue>false</Reissue>
<SelectedPIN>0123</SelectedPIN>
<OdoPrompt>false</OdoPrompt>
<CRNPrompt>false</CRNPrompt>
</Card>
<Card RequestID="5">
<CustomerNumber>XX01234567</CustomerNumber>
<BearerCard>
<Bearer Emboss="true">OPEN XXXXXX</Bearer>
</BearerCard>
<CardTypeID>10</CardTypeID>
<PurchaseCategoryID>11</PurchaseCategoryID>
<Reissue>false</Reissue>
<FleetPIN/>
<OdoPrompt>false</OdoPrompt>
<CRNPrompt>false</CRNPrompt>
</Card>
<Block RequestID="6">
<CustomerNumber>XX01234567</CustomerNumber>
<PAN>7002999999999999991</PAN>
</Block>
<Card RequestID="7"
RequestRef="956EA6C5-7D7E-4622-94D0-38CAD9FCC8DF">
<CustomerNumber>XX01234567</CustomerNumber>
<DriverCard>
<Driver Emboss="true">HOMER SIMPSON</Driver>
<VRN Emboss="true">795 DVI</VRN>
</DriverCard>
<EmbossText>SPRINGFIELD POWER</EmbossText>
<CardTypeID>10</CardTypeID>
<TokenTypeID>20</TokenTypeID>
<PurchaseCategoryID>30</PurchaseCategoryID>
<ExpiryDate>2018-12</ExpiryDate>
<Reissue>true</Reissue>
<SelectedPIN>0123</SelectedPIN>
<OdoPrompt>true</OdoPrompt>
<CRNPrompt>true</CRNPrompt>
<!--address with optional fields specified-->
<CardDeliveryAddress OneTimeUse="false">
<ContactName>M xxxx</ContactName>
<ContactTitle>Mr</ContactTitle>
<CompanyName>Sxxxx</CompanyName>
<Line1>Sector 22-F</Line1>
<Line2>Springfield Power Plant</Line2>
<Line3>xxx Road</Line3>
<City>xxxx</City>
<Zipcode>xxxx</Zipcode>
<CountryCode>xxx</CountryCode>
</CardDeliveryAddress>
<!--address with only required fields-->
<PINDeliveryAddress OneTimeUse="true">
<Line1>xxxx</Line1>
<City>xxx</City>
<Zipcode>xxxx</Zipcode>
<CountryCode>xxxx</CountryCode>
</PINDeliveryAddress>
<Limits>
<Value Transaction="unlimited" Daily="200" Weekly="unlimited" Monthly="400"/>
<Volume Transaction="100" Daily="unlimited" Weekly="unlimited" Monthly="unlimited"/>
<Transactions Daily="unlimited" Weekly="unlimited" Monthly="unlimited"/>
<Day Monday="true" Tuesday="true" Wednesday="true" Thursday="true" Friday="true" Saturday="false" Sunday="false"/>
<Time Start="unlimited" End="17:00:00"/>
</Limits>
<Products>
<FuelProductRestrictionID>40</FuelProductRestrictionID>
<NonFuelProductRestrictionID>51</NonFuelProductRestrictionID>
<NonFuelProductRestrictionID>52</NonFuelProductRestrictionID>
<NonFuelProductRestrictionID>53</NonFuelProductRestrictionID>
<NonFuelProductRestrictionID>54</NonFuelProductRestrictionID>
<NonFuelProductRestrictionID>55</NonFuelProductRestrictionID>
</Products>
</Card>
<Block RequestID="8"
RequestRef="69A3E44D-DC10-4BEE-9249-1FC3C651BA0E">
<CustomerNumber>xxxxx</CustomerNumber>
<PAN>xxxxxx</PAN>
</Block>
</BCIRequest>
I need to update the element value in the above values. The old value is:
<SelectedPIN>0123</SelectedPIN>
And the new value should be:
<SelectedPIN EncryptedPIN="TKDS" FormNumber="000793906306">****</SelectedPIN>
Can anyone can help me on this?
If I selected the BCIRequest element, it's returning a null value. I've tried many solutions but unable to get one working on this XML file.

There many ways an Xml can be be modified, I prefer XDocument
XDocument doc = XDocument.Parse(input);
foreach (var element in doc.Descendants("SelectedPIN")) // filter if you want single element, in example I modifed for all elements.
{
element.Add(new XAttribute("EncryptedPIN", "TKDS"));
element.Add(new XAttribute("FormNumber", "000793906306"));
element.Value = "xxxxx"; //new value
}
and finally you can save the document using
doc.Save();
Take a look at this Demo

The root node (BCIRequest) contains a namespace so you need to include that into your query. Something like this should work:
XNamespace ns = "urn:xxxxxx:bci:request";
IEnumerable<XElement> collection = doc.Elements(ns + "BCIRequest").Elements(ns + "Card").Elements(ns + "SelectedPIN");

Getting an XElement with a namespace via XPathSelectElements

I have an XML e.g.
<?xml version="1.0" encoding="utf-8"?>
<A1>
<B2>
<C3 id="1">
<D7>
<E5 id="abc" />
</D7>
<D4 id="1">
<E5 id="abc" />
</D4>
<D4 id="2">
<E5 id="abc" />
</D4>
</C3>
</B2>
</A1>
This is may sample code:
var xDoc = XDocument.Load("Test.xml");
string xPath = "//B2/C3/D4";
//or string xPath = "//B2/C3/D4[#id='1']";
var eleList = xDoc.XPathSelectElements(xPath).ToList();
foreach (var xElement in eleList)
{
Console.WriteLine(xElement);
}
It works perfectly, but if I add a namespace to the root node A1, this code doesn't work.
Upon searching for solutions, I found this one, but it uses the Descendants() method to query the XML. From my understanding, this solution would fail if I was searching for <E5> because the same tag exists for <D7>, <D4 id="1"> and <D4 id="2">
My requirement is to search if a node exists at a particular XPath. If there is a way of doing this using Descendants, I'd be delighted to use it. If not, please guide me on how to search using the name space.
My apologies in case this is a duplicate.

To keep using XPath, you can use something link this:
var xDoc = XDocument.Parse(#"<?xml version='1.0' encoding='utf-8'?>
<A1 xmlns='urn:sample'>
<B2>
<C3 id='1'>
<D7><E5 id='abc' /></D7>
<D4 id='1'><E5 id='abc' /></D4>
<D4 id='2'><E5 id='abc' /></D4>
</C3>
</B2>
</A1>");
// Notice this
XmlNamespaceManager nsmgr = new XmlNamespaceManager(new NameTable());
nsmgr.AddNamespace("sample", "urn:sample");
string xPath = "//sample:B2/sample:C3/sample:D4";
var eleList = xDoc.XPathSelectElements(xPath, nsmgr).ToList();
foreach (var xElement in eleList)
{
Console.WriteLine(xElement);
}

but it uses the Descendants() method to query the XML. From my understanding, this solution would fail if I was searching for because the same tag exists for , and
I'm pretty sure you're not quite understanding how that works. From the MSDN documentation:
Returns a filtered collection of the descendant elements for this document or element, in document order. Only elements that have a matching XName are included in the collection.
So in your case, just do this:
xDoc.RootNode
.Descendants("E5")
.Where(n => n.Parent.Name.LocalName == "B4");

Try this
var xDoc = XDocument.Parse("<A1><B2><C3 id=\"1\"><D7><E5 id=\"abc\" /></D7><D4 id=\"1\"><E5 id=\"abc\" /></D4><D4 id=\"2\"><E5 id=\"abc\" /></D4></C3></B2></A1>");
foreach (XElement item in xDoc.Element("A1").Elements("B2").Elements("C3").Elements("D4"))
{
Console.WriteLine(item.Element("E5").Value);//to get the value of E5
Console.WriteLine(item.Element("E5").Attribute("id").Value);//to get the value of attribute
}

Cannot get XPath to work with unnamed namespace

The XML (fragment):
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<soap:Body>
<GetXMLResponse xmlns="http://sitecore.net/visual/">
<GetXMLResult>
<sitecore xmlns="">
<status>ok</status>
The code (fragment):
XmlNamespaceManager nsManager = new XmlNamespaceManager(template.NameTable);
nsManager.AddNamespace("soap", "http://schemas.xmlsoap.org/soap/envelope/");
nsManager.PushScope();
XmlNode sitecoreRoot = template.SelectSingleNode("/soap:Envelope/soap:Body/*[namespace-uri()='http://sitecore.net/visual/' and local-name()='GetXMLResponse']", nsManager);
string status = sitecoreRoot.SelectSingleNode("/GetXMLResult/sitecore/status").Value;
sitecoreRoot element returns the correct node. However the XPath to get the status always returns null, even though the siteCoreRoot.OuterXMl property shows the element is present.
The only thing I can think of is the line:
<sitecore xmlns="">
is throwing off the XPath
TIA

XmlNamespaceManager ns = new XmlNamespaceManager(cd.NameTable);
ns.AddNamespace("sp", "http://schemas.xmlsoap.org/soap/envelope/");
ns.AddNamespace("sc", "http://sitecore.net/visual/");
XmlNode sitecoreRoot = cd.SelectSingleNode("//sp:Envelope/sp:Body/sc:GetXMLResponse/sc:GetXMLResult/sitecore/status", ns);
var status = sitecoreRoot.InnerText;
May help you?

If you just want the status node, you can try this xml library and the following XPath.
XElement root = XElement.Load(file); // or .Parse(string)
XElement status = root.XPathElement("//status");
The library handles doing the namespace for you.

C# XPath Not Finding Anything

I'm trying to use XPath to select the items which have a facet with Location values, but currently my attempts even to just select all items fail: The system happily reports that it found 0 items, then returns (instead the nodes should be processed by a foreach loop). I'd appreciate help either making my original query or just getting XPath to work at all.
XML
<?xml version="1.0" encoding="UTF-8" ?>
<Collection Name="My Collection" SchemaVersion="1.0" xmlns="http://schemas.microsoft.com/collection/metadata/2009" xmlns:p="http://schemas.microsoft.com/livelabs/pivot/collection/2009" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<FacetCategories>
<FacetCategory Name="Current Address" Type="Location"/>
<FacetCategory Name="Previous Addresses" Type="Location" />
</FacetCategories>
<Items>
<Item Id="1" Name="John Doe">
<Facets>
<Facet Name="Current Address">
<Location Value="101 America Rd, A Dorm Rm 000, Chapel Hill, NC 27514" />
</Facet>
<Facet Name="Previous Addresses">
<Location Value="123 Anywhere Ln, Darien, CT 06820" />
<Location Value="000 Foobar Rd, Cary, NC 27519" />
</Facet>
</Facets>
</Item>
</Items>
</Collection>
C#
public void countItems(string fileName)
{
XmlDocument document = new XmlDocument();
document.Load(fileName);
XmlNode root = document.DocumentElement;
XmlNodeList xnl = root.SelectNodes("//Item");
Console.WriteLine(String.Format("Found {0} items" , xnl.Count));
}
There's more to the method than this, but since this is all that gets run I'm assuming the problem lies here. Calling root.ChildNodes accurately returns FacetCategories and Items, so I am completely at a loss.
Thanks for your help!

Your root element has a namespace. You'll need to add a namespace resolver and prefix the elements in your query.
This article explains the solution. I've modified your code so that it gets 1 result.
public void countItems(string fileName)
{
XmlDocument document = new XmlDocument();
document.Load(fileName);
XmlNode root = document.DocumentElement;
// create ns manager
XmlNamespaceManager xmlnsManager = new XmlNamespaceManager(document.NameTable);
xmlnsManager.AddNamespace("def", "http://schemas.microsoft.com/collection/metadata/2009");
// use ns manager
XmlNodeList xnl = root.SelectNodes("//def:Item", xmlnsManager);
Response.Write(String.Format("Found {0} items" , xnl.Count));
}

Because you have an XML namespace on your root node, there is no such thing as "Item" in your XML document, only "[namespace]:Item", so when searching for a node with XPath, you need to specify the namespace.
If you don't like that, you can use the local-name() function to match all elements whose local name (the name part other than the prefix) is the value you're looking for. It's a bit ugly syntax, but it works.
XmlNodeList xnl = root.SelectNodes("//*[local-name()='Item']");

How to query xsi:type from an attribute using Linq to XML?

Given this xml:
<?xml version="1.0" encoding="utf-8"?>
<EntityDefinition xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<components>
<component xsi:type="TypeA">
<Property1>100</Property1>
</component>
<component xsi:type="TypeB">
<Property2>100</Property2>
</component>
</components>
</EntityDefinition>
I would like to loop on the components and instantiate each object based on the xsi:type attribute.
Here’s some Linq to XML code:
IEnumerable<XElement> components =
from c in elementsFromFile.Descendants("component")
select (XElement)c;
foreach (XElement e in components)
{
var type = e.Attributes("xsi:type");
}
Unfortunately, the line “var type = e.Attributes("xsi:type");” does not work because colons are not allowed in a name.
Any idea on how I can query the xsi:type attribute from each element?
Thank you,
Rick

XNamespace ns = "http://www.w3.org/2001/XMLSchema-instance";
...
var type = e.Attributes(ns + "type");