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Load XML containing multiple lists to multiple DataTables

I have an XML that has the below structure:
<?xml version="1.0" encoding="utf-8"?>
<n0:Response xmlns:n0="urn:sap-com:document:sap:rfc:functions">
<Cars>
<item>
<ID>1</ID>
<TYPE>SUV</TYPE>
<YEAR>2022</YEAR>
</item>
<item>
<ID>2</ID>
<TYPE>Convertible</TYPE>
<YEAR>2021</YEAR>
</item>
</Cars>
<Employees>
<item>
<ID>1</ID>
<NAME>John</NAME>
<STATUS>1</STATUS>
<PHONE>000000000</PHONE>
</item>
<item>
<ID>2</ID>
<NAME>Sam</NAME>
<STATUS>2</STATUS>
<PHONE>000000000</PHONE>
</item>
<item>
<ID>3</ID>
<NAME>Jane</NAME>
<STATUS>1</STATUS>
<PHONE>000000000</PHONE>
</item>
</Employees>
</n0:Response>
(this is just a sample, the final file will have more than 10k items per row)
I need to load that file to two DataTables, each having the correct values.
I do this by creating DataSet, loading XML, and filtering the data table.
My DataSet has 3 tables:
but when I try to access the correct data table I get all the items instead of the correct ones (I get items from the entire XML):
var rel = ds.Relations.OfType<DataRelation>()
.FirstOrDefault(x => x.ParentTable.TableName == "Cars")?.ChildTable;
this is the result:
I managed to filter the data by adding a Select statement like below:
var ds = new DataSet();
using Stream stream = new FileStream("Sample.xml", FileMode.Open, FileAccess.Read);
ds.ReadXml(stream);
var table1 = ds.Relations.OfType<DataRelation>()
.FirstOrDefault(x => x.ParentTable.TableName == "Cars")?
.ChildTable.Select("Cars_Id = 0").CopyToDataTable();
var table2 = ds.Relations.OfType<DataRelation>()
.FirstOrDefault(x => x.ParentTable.TableName == "Employees")?
.ChildTable.Select("Employees_Id = 0").CopyToDataTable();
but this isn't generic and I'd like to be able to access the correct DataTable only by name (the node name from XML).
My question is similar to How to get multiple tables in Dataset from XML, but the provided answer didn't solve the issue.

How can I select a specific XML node and fetch the values in its child nodes

I'm trying to select a specific node and fetch the values in it's childnodes. This would normally be pretty easy, but the complication is that the nodes have the same name. My xml looks something like this;
<Settings>
<Config>
</Config>
<Items>
<Item>
<ID>Hello</ID>
<Pth>Somevalue</Pth>
<Zvb>True</Zvb>
<Ico>True</Ico>
</Item>
<Item>
<ID>Stack</ID>
<Pth>Somevalue</Pth>
<Zvb>False</Zvb>
<Ico>True</Ico>
</Item>
<Item>
<ID>Overflow</ID>
<Pth>Somevalue</Pth>
<Zvb>False</Zvb>
<Ico>True</Ico>
</Item>
</Items>
</Settings>
Each <ID>'s innertext is always unique. I now want to select the <Item> ,where it's <ID>'s innertext is "Stack". (I need the other childnode-values as well, like Pth, Zvb and Ico. So everything under <Item> basically)
I did this is powershell, and it looks something like this;
$script:specificItem = $dgvItems.rows[$_.RowIndex].Cells[1].Value
$script:fetch = #($xml.SelectNodes('//Item')) | Select-Object * | Where { $_.ID -like $specificItem }
So far I've got this (I'm in a RowEnter event of a datagridview):
XmlDocument xml = new XmlDocument();
xml.Load(GlobalVars.configfile);
int rowindex = dgvItemlist.CurrentCell.RowIndex;
dgvItemlist.Rows[rowindex].Cells[2].Value.ToString(); //This will contain for example "Stack"
XmlNodeList Items = xml.SelectNodes("//Items/Item"); //probably other ways to start as well
... but from here I struggle with filtering or selecting the one I want. I know this is a fairly common question, but I can't find a good solution for this exact issue.

You could also use XDocument (Linq to XML):
string xml =#"<Settings>
<Config>
</Config>
<Items>
<Item>
<ID>Hello</ID>
<Pth>Somevalue</Pth>
<Zvb>True</Zvb>
<Ico>True</Ico>
</Item>
<Item>
<ID>Stack</ID>
<Pth>Somevalue</Pth>
<Zvb>False</Zvb>
<Ico>True</Ico>
</Item>
<Item>
<ID>Overflow</ID>
<Pth>Somevalue</Pth>
<Zvb>False</Zvb>
<Ico>True</Ico>
</Item>
</Items>
</Settings>";
XDocument xdoc = XDocument.Parse(xml);
XElement desired = xdoc.Descendants("Item").FirstOrDefault(x=>(string)x.Element("ID")=="Stack");
if(desired!=null)
{
string Pth = (string)desired.Element("Pth");
string Zvb = (string)desired.Element("Zvb");
string Ico = (string)desired.Element("Ico");
}
desired will be the wanted element.

Try to change the last line of your code into:
XmlNodeList Items = xml.SelectNodes("//Items/Item[ID='Stack']");
This should return:
<Item>
<ID>Stack</ID>
<Pth>Somevalue</Pth>
<Zvb>False</Zvb>
<Ico>True</Ico>
</Item>

Try the following. It will return the specific node you are looking for.
XmlNode itemNode = doc.SelectSingleNode("//ID[text()='Stack']").ParentNode;

Order frequent XML Data by group using LINQ

I have an XDocument with this data:
<item>
<name>Name 1</name>
<group>foo</group>
...
</item>
<item>
<name>Name 2</name>
<group>bar</group>
...
</item>
<item>
<name>Name 3</name>
<group>foo</group>
...
</item>
That means I have 2 items with group = foo and 1 item with group = bar. How can I order that data by the most frequent group? Result:
<item>
<name>Name 1</name>
<group>foo</group>
...
</item>
<item>
<name>Name 3</name>
<group>foo</group>
...
</item>
<item>
<name>Name 2</name>
<group>bar</group>
...
</item>
Data is loaded like this:
XDocument xml = XDocument.Load(#"\path\data.xml");

You can use a simple GroupBy and OrderByDescending:
var items = xml.Root.Elements()
.GroupBy(r => r.Element("group").Value)
.OrderByDescending(r => r.Count())
.ToList();
Then simply remove all nodes and add them ordered:
xml.Root.RemoveAll();
xml.Root.Add(items);

If you want to work with objects instead of the xml, you'll first need to deserialize the xml into a List<Item>, where each Item is a class of the same structure in the xml.
After that, when you have the list you can use GroupBy:
var newList = list.GroupBy(i => i.Group) //group together by "group" value
.OrderByDescending(i => i.Count()) //simple ordering
.SelectMany(i => i) //flatten the hierarchy
.ToList(); //back to list

Add XML node where element value equal n

I have a XML file which looks like
<?xml version="1.0" encoding="utf-8"?>
<Orders>
<Order>
<OrderNumber>123</OrderNumber>
<ClientName>Name</ClientName>
<TotalOrderCost>50</TotalOrderCost>
<Products>
<Product>
<Name>Games</Name>
<Quantity>3</Quantity>
<Price>10</Price>
<TotalProductPrice>30</TotalProductPrice>
</Product>
<Product>
<Name>CDs</Name>
<Quantity>2</Quantity>
<Price>10</Price>
<TotalProductPrice>10</TotalProductPrice>
</Product>
</Products>
</Order>
<Order>
<OrderNumber>456</OrderNumber>
<ClientName>Name 2</ClientName>
<TotalOrderPrice>15</TotalOrderPrice>
<Products>
<Product>
<Name>Tea</Name>
<Quantity>1</Quantity>
<Price>15</Price>
<TotalProductPrice>15</TotalProductPrice>
</Product>
</Products>
</Order>
</Orders>
I have a form where the user selects an order and can add more products in it. I can output the correct XElement which looks like:
<Product>
<Name>Coffee</Name>
<Quantity>1</Quantity>
<Price>15</Price>
<TotalProductPrice>15</TotalProductPrice>
</Product>
How do I add this XElement under the products of an order user has selected? So if the user selects OrderNumer = 456 and adds the product using the form, the XElement goes under 456 order.
I have tried:
xmldoc2.Element("Orders").Element("Order").Element("Products").Add(addProduct);
xmldoc2.Save(orderFilePath);
which always adds the product to the first order on the XML and I can see the reason for it however I cannot see how I could add under the product under the order selected.

You should select order element to which you want to add new product:
int number = 456;
var order = xmldoc2.Element("Orders").Element("Order")
.FirstOrDefault(o => (int)o.Element("OrderNumber") == number);
// check if order not null
order.Element("Products").Add(addProduct);
You also can use XPath for selecting order:
var xpath = String.Format("//Order[OrderNumber[text()={0}]]", number);
var order = xmldoc2.XPathSelectElement(xpath);

Need a Nested LINQ to XML query help

i have a XML file as follows:
<?xml version="1.0" encoding="utf-8" ?>
<publisher>
<name>abc</name>
<link>http://</link>
<description>xyz</description>
<category title="Top">
<item>
<title>abc</title>
<link>http://</link>
<pubDate>1</pubDate>
<description>abc</description>
</item>
<item>
<title>abc</title>
<link>http://</link>
<pubDate>2</pubDate>
<description>abc</description>
</item>
</category>
<category title="Top2">
<item>
<title>abc</title>
<link>http://</link>
<pubDate>1</pubDate>
<description>abc</description>
</item>
<item>
<title>abc</title>
<link>http://</link>
<pubDate>2</pubDate>
<description>abc</description>
</item>
</category>
</publisher>
I need to write a LINQ to XML query in C# which returns everything under a "category" tag based on the value of attribute provided. I have tried the following code but it gives me error. Any help will be appreciated:
System.Xml.Linq.XElement xml = System.Xml.Linq.XElement.Parse(e.Result);
IEnumerable<string> items = from category in xml.Elements("category")
where category.Attribute("title").Value == "Top"
select category.ToString();

IEnumerable<string> items = from category in xml.Descendants("category")
where category.Attribute("title").Value == "Top"
select category.ToString();
Of course, that's going to give you a list with one string in it. If you want just the string in it:
var items = (from category in xml.Descendants("category")
where category.Attribute("title").Value == "Top"
select category.ToString()).First();
But, if you want to continue processing the XML, you probably really want it as a XElement object:
var items = (from category in xml.Descendants("category")
where category.Attribute("title").Value == "Top"
select category).First();