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Access Child nodes with namespace using xpath

How can I read the content of the childnotes using Xpath?
I have already tried this:
var xml = new XmlDocument();
xml.Load("server-status.xml");
var ns = new XmlNamespaceManager(xml.NameTable);
ns.AddNamespace("ns", "namespace");
var node = xml.SelectSingleNode("descendant::ns:server[ns:ip-address]", ns)
Console.WriteLine(node.InnerXml)
But I only get a string like this:
<ip-address>127.0.0.50</ip-address><name>Server 1</name><group>DATA</group>
How can I get the values individually?
Xml file:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<server-status xmlns="namespace">
<server>
<ip-address>127.0.0.50</ip-address>
<name>Server 1</name>
<group>DATA</group>
</server>
</server-status>

You're using XML namespaces in XPath correctly.
However, your original XPath,
descendant::ns:server[ns:ip-address]
says to select all ns:server elements with ns:ip-address children.
If you wish to select the ns:ip-address children themselves, instead use
descendant::ns:server/ns:ip-address
Similarly, you could select ns:name or ns:group elements.

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));
}

Get specific values from Xml

I don't how to extract the values from XML document, and am looking for some help as I'm new to C#
I am using XmlDocument and then XmlNodeList for fetching the particular XML document
Here is my code
XmlNodeList XMLList = doc.SelectNodes("/response/result/doc");
And my XML looks like this:
<?xml version="1.0" encoding="UTF-8"?>
<response>
<result>
<doc>
<long name="LoadID">494</long>
<long name="EventID">5557</long>
<str name="XMLData"><TransactionDate>2014-05-28T14:17:31.2186777-06:00</TransactionDate><SubType>tblQM2222Components</SubType><IntegerValue title="ComponentID">11111</IntegerValue></str></doc>
<doc>
<long name="LoadID">774</long>
<long name="EventID">5558</long>
<str name="XMLData"><TransactionDate>2014-05-28T14:17:31.2186777-06:00</TransactionDate><SubType>tblQM2222Components</SubType><IntegerValue title="ComponentID">11111</IntegerValue></str></doc>
</result>
</response>
In this i have to fetch every the XMLData data that is under every doc tag and i have to fetch last doc tag EventID.

var xml = XDocument.Parse(xmlString);
var docs = xml.Root.Elements("doc");
var lastDocEventID = docs.Last()
.Elements("long")
.First(l => (string)l.Attribute("name") == "EventID")
.Value;
Console.WriteLine ("Last doc EventId: " +lastDocEventID);
foreach (var doc in docs)
{
Console.WriteLine (doc.Element("str").Element("TransactionDate").Value);
}
prints:
Last doc EventId: 5558
2014-05-28T14:17:31.2186777-06:00
2014-05-28T14:17:31.2186777-06:00

You can use two XPath expressions to select the nodes you want. To answer each part of your question in turn:
To select all of the XMLData nodes:
XmlNodeList XMLList
= doc.SelectNodes("/response/result/doc/str[#name='XMLData']");
To select the last EventId:
XmlNode lastEventIdNode =
doc.SelectSingleNode("/response/result/doc[position() =
last()]/long[#name='EventID']");
If not all doc nodes are guaranteed to have an event id child node, then you can simply:
XmlNodeList eventIdNodes =
doc.SelectNodes("/response/result/doc[long[#name='EventID']]");
XmlNode lastNode = eventIdNodes[eventIdNodes.Count - 1];
That should give you what you've asked for.
Update;
If you want the XML data inside each strXml element, you can use the InnerXml property:
XmlNodeList xmlList
= doc.SelectNodes("/response/result/doc/str[#name='XMLData']");
foreach(XmlNode xmlStrNode in xmlList)
{
string xmlInner = xmlStrNode.InnerXml;
}

There's one result tag short in your xml.
Try using this. It's cleaner too imho
XmlNodeList docs = doc.SelectSingleNode("response").SelectSingleNode("result").SelectNodes("doc");
Then you can use a combination of SelectSingleNode, InnerText, Value to get the data from each XmlNode in your list.
For example if you want the EventID from the first doc tag:
int eventID = int.Parse(docs[0].SelectSingleNode("long[#name='EventID']").InnerText);

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)));

Selecting values from an xml document object with XPATH in code behind (c#)

I am trying to select specific values from a xml document using XPath. The xml is stored into a string varibale "tmp". This xml is the result of a query performed on a external API.
sample XML contents:
<?xml version="1.0" encoding="ISO-8859-1"?>
<Results>
<Checks>
<Check id="wbc">
<Linespeed>6000 </Linespeed>
<Provider>BT WBC </Provider>
</Check>
<Check id="adsl">
<Linespeed>2048 </Linespeed>
<Provider>BT ADSL </Provider>
</Check>
</Checks>
</Results>
Using XPATH in code behind I want to be able to select the and only for id=adsl, then store the value in a string variable for later use. I want to achieve this withouth the use of a separate xslt stylesheet.
Here is the code I have written for this but I am getting an error:
//Creating an XPATH epression
String strExpression1;
strExpression1 = "Results/Checks/Check[#id = 'adsl']/Linespeed";
//Loading the xml document
XmlDocument doc;
doc = new XmlDocument();
doc.LoadXml(tmp);
//Create an XmlNamespaceManager to resolve the default namespace.
XmlNamespaceManager nsmgr = new XmlNamespaceManager(doc.NameTable);
nsmgr.AddNamespace("bk", "urn:schemas-microsoft-com:xslt");
//Selecting Linespeed from Check id='adsl'
XmlNode Check;
XmlElement root = doc.DocumentElement;
Check = root.SelectSingleNode(strExpression1, nsmgr);
//Assigning the the results of the XPATH expression to the variable Linespeedval
string Linespeedval = Check.ToString();
//Adding a control to display the xpath results of the "tmp" xml objectt
AvailabilityCheckerResults2.Controls.Add(new LiteralControl(Linespeedval));
Any assistance will be greately appreciated! Thanks in advance!

strExpression1 = "/Results/Checks/Check[#id = 'adsl']/Linespeed";
//or strExpression1 = "//Checks/Check[#id = 'adsl']/Linespeed";
//doc has no namespace
Check = root.SelectSingleNode(strExpression1);
....
string Linespeedval = Check.InnerText;

Take a look at this article. It has step by step instruction to parse xml using xpath.
How to query XML with an XPath expression by using Visual C#