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How to move up the XML `Element` one step higher and change its `XName` to this format `parent_child` using `Linq to XML` in C#

I am trying to modify the following XML doc (MRE) using Linq to XML:
Move the school name and address one step higher or at the level of its parent—school element.
At the same time, change its name to <School_Name> and <School_Address>.
ORIGINAL
<?xml version="1.0" encoding="utf-8"?>
<GreatGrandParent>
<GrandParent>
<Parent>
<Child>
<Name>John</Name>
<Address>California</Address>
<Sex>Male</Sex>
<Age>18</Age>
<School>
<Name>Cool School</Name>
<Address>California</Address>
</School>
</Child>
<Child>
<Name>Mary</Name>
<Address>New Orleans</Address>
<Sex>Female</Sex>
<Age>16</Age>
<School>
<Name>Pretty School</Name>
<Address>New Orleans</Address>
</School>
</Child>
<Parent>
<GrandParent>
<GreatGrandParent>
TARGET MODIFICATION
<?xml version="1.0" encoding="utf-8"?>
<GreatGrandParent>
<GrandParent>
<Parent>
<Child>
<Name>John</Name>
<Address>California</Address>
<Sex>Male/Sex>
<Age>18</Age>
<School_Name>Cool School</School_Name>
<School_Address>California</School_Address>
</Child>
<Child>
<Name>Mary</Name>
<Address>New Orleans</Address>
<Sex>Female/Sex>
<Age>16</Age>
<School_Name>Pretty School</School_Name>
<School_Address>New Orleans</School_Address>
</Child>
<Parent>
<GrandParent>
<GreatGrandParent>
HERE'S WHAT I HAVE DONE SO FAR:
XDocument doc = XDocument.Load(#"D:\Xml\Childs Profile.xml");
XElement root = doc.XPathSelectElement("//Parent");
IEnumerable<XElement> rootlists = root.Descendants("Child").ToList();
foreach (var rootlist in rootlists)
{
XElement lists = root.Element("Child");
XElement name = root.Element("Child").Element("School").Element("Name");
XElement address = root.Element("Child").Element("School").Element("Address");
list.AddFirst(name);
list.AddFirst(address);
XElement school = root.Element("Child").Element("School");
school.Remove();
}
doc.Save(#"D:\Xml\Childs Profile.xml");
ISSUES: The foreach above does not move to next child.
PENDING: Change the XName to <School_Name> and <School_Address> either before or after moving.

You can try this:
XDocument doc = XDocument.Load(#"the.xml");
var child = doc.Descendants("Child");
var school = child.Elements("School");
string name = $"{school.First().Name}_{school.Elements("Name").First().Name}";
string address = $"{school.First().Name}_{school.Elements("Address").First().Name}";
foreach (var s in school)
{
s.Parent.Add(new XElement(name, s.Element("Name").Value));
s.Parent.Add(new XElement(address, s.Element("Address").Value));
}
school.Remove();
doc.Save(#"out.xml");

Unable to parse xml string using Xdocument and Linq

I would like to parse the below xml using XDocument in Linq.
<?xml version="1.0" encoding="UTF-8"?>
<string xmlns="http://tempuri.org/">
<Sources>
<Item>
<Id>1</Id>
<Name>John</Name>
</Item>
<Item>
<Id>2</Id>
<Name>Max</Name>
</Item>
<Item>
<Id>3</Id>
<Name>Ricky</Name>
</Item>
</Sources>
</string>
My parsing code is :
var xDoc = XDocument.Parse(xmlString);
var xElements = xDoc.Element("Sources")?.Elements("Item");
if (xElements != null)
foreach (var source in xElements)
{
Console.Write(source);
}
xElements is always null. I tried using namespace as well, it did not work. How can I resolve this issue?

Try below code:
string stringXml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><string xmlns=\"http://tempuri.org/\"><Sources><Item><Id>1</Id><Name>John</Name></Item><Item><Id>2</Id><Name>Max</Name></Item><Item><Id>3</Id><Name>Ricky</Name></Item></Sources></string>";
XDocument xDoc = XDocument.Parse(stringXml);
var items = xDoc.Descendants("{http://tempuri.org/}Sources")?.Descendants("{http://tempuri.org/}Item").ToList();
I tested it and it correctly shows that items has 3 lements :) Maybe you used namespaces differently (it's enough to inspect xDoc objct in object browser and see its namespace).

You need to concatenate the namespace and can directly use Descendants method to fetch all Item nodes like:
XNamespace ns ="http://tempuri.org/";
var xDoc = XDocument.Parse(xmlString);
var xElements = xDoc.Descendants(ns + "Item");
foreach (var source in xElements)
{
Console.Write(source);
}
This prints on Console:
<Item xmlns="http://tempuri.org/">
<Id>1</Id>
<Name>John</Name>
</Item><Item xmlns="http://tempuri.org/">
<Id>2</Id>
<Name>Max</Name>
</Item><Item xmlns="http://tempuri.org/">
<Id>3</Id>
<Name>Ricky</Name>
</Item>
See the working DEMO Fiddle

Help with SelectSingleNode, XML and C#

I have the following SOAP response:
<?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>
<ABRSearchByABNResponse xmlns="http://abr.business.gov.au/ABRXMLSearch/">
<ABRPayloadSearchResults>
<request>
<identifierSearchRequest>
<identifierType>ABN</identifierType>
<identifierValue>79 142 357 604</identifierValue>
</identifierSearchRequest>
</request>
<response>
<dateRegisterLastUpdated>2011-04-26</dateRegisterLastUpdated>
<dateTimeRetrieved>2011-04-26T14:10:17.8169921+10:00</dateTimeRetrieved>
<businessEntity>
<recordLastUpdatedDate>2010-03-05</recordLastUpdatedDate>
<ABN>
<identifierValue>79142357604</identifierValue>
<isCurrentIndicator>Y</isCurrentIndicator>
<replacedIdentifierValue xsi:nil="true" />
<replacedFrom>0001-01-01</replacedFrom>
</ABN>
<entityStatus>
<effectiveTo>0001-01-01</effectiveTo>
</entityStatus>
<entityType>
<entityTypeCode>PUB</entityTypeCode>
</entityType>
<mainBusinessPhysicalAddress>
<stateCode>NSW</stateCode>
<postcode>2000</postcode>
</mainBusinessPhysicalAddress>
</businessEntity>
</response>
</ABRPayloadSearchResults>
</ABRSearchByABNResponse>
</soap:Body>
</soap:Envelope>
What I am trying to get is the entityTypeCode but I have no success. I tried with
XmlDocument xDoc = new XmlDocument();
xDoc.LoadXml(searchPayload);
XmlNamespaceManager nsmgr = new XmlNamespaceManager(xDoc.NameTable);
nsmgr.AddNamespace("c", "http://abr.business.gov.au/ABRXMLSearch/");
XmlNode entityTypeCode = xDoc.SelectSingleNode("//entityTypeCode", nsmgr);
and various xpath expressions but it the xmlnode entityTypeCode is always null.
Suggestions?
Thanks in advance.

use XmlNode entityTypeCode = xDoc.SelectSingleNode("//c:entityTypeCode", nsmgr); as you have added the namespace of the element as c prefix in the namespace manager.

Work with XML file

I have a sitemap file for search engines:
<?xml version="1.0" encoding="utf-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd">
<url>
<loc>http://site.com/</loc>
</url>
<url>
<loc>http://site.com/about</loc>
</url>
<url>
<loc>http://site.com/contacts</loc>
</url>
<url>
<loc>http://site.com/articles/article1.html</loc>
</url>
<url>
<loc>http://site.com/users/123</loc>
</url>
</urlset>
How to insert a new node?
When I use xDoc.Element("url") or xDoc.Element("urlset") or xDoc.Element("xml") or Doc.Elements(...) I get null always. It's very strange.

The code below shows how to navigate within the xml and how to insert a new node
XDocument xDoc = XDocument.Load("sitemap.xml");
XNamespace ns = xDoc.Root.Name.Namespace;
// Navigation within the xml
XElement urlset = xDoc.Element(ns + "urlset");
Console.WriteLine(urlset.Name.LocalName); // -> "urlset"
IEnumerable<XElement> urls = urlset.Elements(ns + "url");
foreach (var url in urls)
{
XElement loc = url.Element(ns + "loc");
Console.WriteLine(loc.Value); // -> "http://site.com/", ...
}
// Inserting a new node under "urlset" node
urlset.Add(
new XElement(ns + "url",
new XElement(ns + "loc",
"http://site.com//questions/4183526")));

Issues querying google sitemap.xml with Linq to XML

I have a Linq-2-XML query that will not work if a google sitemap that I have created has its urlset element populated with attributes but will work fine if there are no attributes present.
Can't query:
<?xml version="1.0" encoding="utf-8"?>
<urlset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9
http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd"
xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<url>
<loc>http://www.foo.com/index.htm</loc>
<lastmod>2010-05-11</lastmod>
<changefreq>monthly</changefreq>
<priority>1.0</priority>
</url>
<url>
<loc>http://www.foo.com/about.htm</loc>
<lastmod>2010-05-11</lastmod>
<changefreq>monthly</changefreq>
<priority>1.0</priority>
</url>
</urlset>
Can query:
<?xml version="1.0" encoding="utf-8"?>
<urlset>
<url>
<loc>http://www.foo.com/index.htm</loc>
<lastmod>2010-05-11</lastmod>
<changefreq>monthly</changefreq>
<priority>1.0</priority>
</url>
<url>
<loc>http://www.foo.com/about.htm</loc>
<lastmod>2010-05-11</lastmod>
<changefreq>monthly</changefreq>
<priority>1.0</priority>
</url>
</urlset>
The query:
XDocument xDoc = XDocument.Load(#"C:\Test\sitemap.xml");
var sitemapUrls = (from l in xDoc.Descendants("url")
select l.Element("loc").Value);
foreach (var item in sitemapUrls)
{
Console.WriteLine(item.ToString());
}
What would be the reason for this?

See the "xmlns=" tag in the XML? You need to specify the namespace. Test the following modification of your code:
XDocument xDoc = XDocument.Load(#"C:\Test\sitemap.xml");
XNamespace ns = "http://www.sitemaps.org/schemas/sitemap/0.9";
var sitemapUrls = (from l in xDoc.Descendants(ns + "url")
select l.Element(ns + "loc").Value);
foreach (var item in sitemapUrls)
{
Console.WriteLine(item.ToString());
}