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C# Find Attribute in XML with another Attribute with Descendants

First I want to find and select the PID"5678" from the <Tool>. With help of this PID, i want to find and select the ID"5678" from the <Parent>. The PID and the ID are the same value, but I have to find it from the <Tool> first.
At the moment I have following Code, to select the first PID. How can I "copy" this value and search with them the Attribute "ID"?
List<string> urls = xmldoc2.Descendants("PID").Select(x => x.Attribute("5678").Value).ToList();
<Tools>
<Tools>
<Tool>
<ID>1234</ID>
<PID>5678</PID>
<Name>Test</Name>
</Tool>
</Tools>
<Type>
<Parent>
<ID>5678</ID>
<PID>9999</PID>
<Name>Test2</Name>
</Parent>
</Type>
</Tools>

Notice that your Xml has multiple Root nodes - which does not work well.
So wrap it into single parent node (i.e. "Root" in below example)
Something of this sort should help you.
string xmlData = #"... Your Xml here....";
var xmlDoc = new XmlDocument();
xmlDoc.LoadXml(xmlData);
var pidNodes = xmlDoc.SelectNodes("//Root/Tools/Tools/Tool/PID");
foreach(XmlNode node in pidNodes)
{
var typeNodeForPid = xmlDoc.SelectSingleNode(string.Format("//Root/Type/Parent[ID = '{0}']", node.InnerText));
}

Select last XML node

I have this XML code:
<AriaGostarInformation>
<MenuInformation>
<MenuNames Name="0" href="default.aspx">home</MenuNames>
<SubMenuNames parentName="1">
fgfgfgfgs
</SubMenuNames>
<SubMenuNames parentName="3">
</SubMenuNames>
</MenuInformation>
<SliderInformation>
<SliderImageAddress>..\..\Img\Hydrangeas.jpg,</SliderImageAddress>
<SliderImageAddress>..\..\Img\Jellyfish.jpg,</SliderImageAddress>
<SliderImageAddress>..\..\Img\Koala.jpg,</SliderImageAddress>
<SliderImageAddress>..\..\Img\Lighthouse.jpg,</SliderImageAddress>
<SliderImageAddress>..\..\Img\Penguins.jpg,</SliderImageAddress>
<SliderImageAddress>..\..\Img\Tulips.jpg,</SliderImageAddress>
</SliderInformation>
<LastProductInformation>
<Product Name="147">
<Subject>
</Subject>
<ProductImageAddress>http://localhost:1209/ckeditor/plugins/imagebrowser/browser/Hydrangeas.jpg</ProductImageAddress>
<ProductDes>
<p><span style="color:#FFA07A;">qwqweqweqe</span>qwe</p>
<p><span style="font-size:11px;">qweqweqw</span>e</p>
</ProductDes>
</Product>
<Product Name="dsa">
<Subject>salm</Subject>
<ProductImageAddress>http://localhost:1209/ckeditor/plugins/imagebrowser/browser/Hydrangeas.jpg</ProductImageAddress>
<ProductDes>
<p>sdADASDASDASDASDASDASD</p>
<p>ASDASDASDADASDASDASDASDA</p>
<p>ASDASDASDASDASDASDASDASDASD</p>
</ProductDes>
</Product>
</LastProductInformation>
</AriaGostarInformation>
I want select last product node in LastProductInformation and get this node's attribute.
My code is:
XmlDocument xdoc = new XmlDocument();
xdoc.Load(AppDomain.CurrentDomain.BaseDirectory + #"\static\css\xml\data.xml");
XmlNode xparent = xdoc.SelectSingleNode("//LastProductInformation");
var b = xparent.SelectSingleNode("/Product[last()]").Attributes["Name"].Value;
but this returns null. What should I do?

Using LINQ to XML
var value = XDocument.Load("path")
.Descendants("Product")
.Last()
.Attribute("Name").Value;
Also you can use XPath with LINQ to XML
var value = XDocument.Load("path")
.XPathSelectElement("//LastProductInformation/Product[last()]")
.Attribute("Name").Value;
Note: Make sure you have a reference to System.Xml.Linq namespace from your project.

You don't have to change to linq.
var b = xparent.SelectSingleNode("//Product")[last()].Attributes["Name"].Value;
The last() works like an index so should be at the end.

Getting attributes from same-named XDocument elements using LINQ

I've been coding a program that stores employee data using XDocument:
<!-- School Employee Data -->
<SchoolData storeName="mikveIsrael" location="mikve">
<employee id="1">
<personalInfo>
<name>Ilan Berlinbluv</name>
<zip>58505</zip>
</personalInfo>
<employeeInfo>
<salary>5000</salary>
<id>1</id>
</employeeInfo>
</employee>
<employee id="2">...</employee>
</SchoolData>
I want my program to read every employee id attrib, but I don't know how to do so. Instead, I tried doing this:
var ids = from idz in doc.Descendants("SchoolData")
select new
{
id1 = idz.Element("employee").Attribute("id").Value
};
where doc is the XDocument var. It returns just the first one, but I want it to return an array or List<string>, I just don't know how to iterate through all the same-named employee elements.

XDocument doc = XDocument.Parse(xml);
List<string> ids = doc.Descendants("employee")
.Select(e => e.Attribute("id").Value)
.ToList();

This may helps:
var xDoc = XDocument.Load(path);
var result = xDoc.Descendants("employee")
.SelectMany(i => i.Attribute("id").Value)
.ToList();

How do I read all XML nodes of a specific name and put them into an array (or list)?

I have an XML:
<?xml version="1.0" encoding="UTF-8"?>
<ticket>
<comments type="array">
<comment>
<attachments type="array">
<attachment>
<url>I NEED WHATEVER IS IN HERE</url>
</attachment>
</attachments>
</comment>
<comment>
<attachments type="array">
<attachment>
<url>I NEED WHATEVER IS IN HERE</url>
</attachment>
</attachments>
<comment>
</comments>
</ticket>
How would I go about getting whatever is inside the URL tag and add it to a <List>? I'm using C#.

Use:
var result = XDocument.Parse(inputXml)
.DescendantNodes().OfType<XText>().Select(e => e.Value).ToList();
Or using XPath:
var result = ((IEnumerable)XDocument.Parse(input).XPathEvaluate("//text()"))
.Cast<XText>().ToList();
To retrieve text only from url element use:
var result = XDocument.Parse(inputXml)
.Descendants("url").Select(e => e.Value).ToList();
or change above XPath: //url/text()

using (StringReader sr = new StringReader(xml_content))
{
XDocument xdoc = XDocument.Load(sr);
IList<string> values = xdoc.XPathSelectElements("ticket/comments/attachments/url").Select(e => e.Value).ToList();
}
Or, based on your use case in your comment:
var doc = new XmlDocument();
doc.LoadXml(xml_content);
IList<string> values = doc.SelectNodes("ticket/comments/attachments/url")
.Cast<XmlElement>().Select(e => e.InnerText).ToList();

Or you can use var values = xdoc.SelectSingleNode("ticket/comments/attachments/url").InnerXml;

How can I get all the nodes of a xml file?

Let's say I have this XML file:
<Names>
<Name>
<FirstName>John</FirstName>
<LastName>Smith</LastName>
</Name>
<Name>
<FirstName>James</FirstName>
<LastName>White</LastName>
</Name>
</Names>
And now I want to print all the names of the node:
Names
Name
FirstName
LastName
I managed to get the all in a XmlNodeList, but I dont know how SelectNodes works.
XmlNodeList xnList = xml.SelectNodes(/*What goes here*/);
I want to select all nodes, and then do a foreach of xnList (Using the .Value property I assume).
Is this the correct approach? How can I use the selectNodes to select all the nodes?

Ensuring you have LINQ and LINQ to XML in scope:
using System.Linq;
using System.Xml.Linq;
If you load them into an XDocument:
var doc = XDocument.Parse(xml); // if from string
var doc = XDocument.Load(xmlFile); // if from file
You can do something like:
doc.Descendants().Select(n => n.Name).Distinct()
This will give you a collection of all distinct XNames of elements in the document. If you don't care about XML namespaces, you can change that to:
doc.Descendants().Select(n => n.Name.LocalName).Distinct()
which will give you a collection of all distinct element names as strings.

There are several ways of doing it.
With XDocument and LINQ-XML
foreach(var name in doc.Root.DescendantNodes().OfType<XElement>().Select(x => x.Name).Distinct())
{
Console.WriteLine(name);
}
If you are using C# 3.0 or above, you can do this
var data = XElement.Load("c:/test.xml"); // change this to reflect location of your xml file
var allElementNames =
(from e in in data.Descendants()
select e.Name).Distinct();

Add
using System.Xml.Linq;
Then you can do
var element = XElement.Parse({Your xml string});
Console.Write(element.Descendants("Name").Select(el => string.Format("{0} {1}", el.Element("FirstName").Value, el.Element("LastName").Value)));