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LINQ xml finding nodes returns null

I try to parse an xml file with XDocument class, with criteria that if the child node matches a given string, its parent node is selected.
<SalesQuotes xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://api.some.com/version/1">
<Pagination>
<NumberOfItems>2380</NumberOfItems>
<PageSize>200</PageSize>
<PageNumber>1</PageNumber>
<NumberOfPages>12</NumberOfPages>
</Pagination>
<SalesQuote>
<Guid>825634b9-28f5-4aa7-98e7-5e4a4ed6bc6a</Guid>
<LastModifiedOn>2018-01-09T12:23:56.6133445</LastModifiedOn>
<Comments>Please note:
installation is not included in this quote
</Comments>
</SalesQuote>
</SalesQuotes>
I tried using
var contents = File.ReadAllText(path: "test1.xml");
var doc = XDocument.Parse(contents);
var root = doc.Root;
var sq = root.Elements("SalesQuote");//return null
var theQuote = root.Elements("SalesQuote").Where(el => el.Element("Guid").Value == "825634b9-28f5-4aa7-98e7-5e4a4ed6bc6a");//return null
var theAlternativeQuote =
from el in doc.Descendants("SalesQuote").Elements("Guid")
where el.Value == "825634b9-28f5-4aa7-98e7-5e4a4ed6bc6a"
select el;//return null
I can't seem to find what's wrong.
Any help is much appreciated! Thanks.

You ignored the namespace bro.
Do remove the xmlns attribute in your XML or try this:
var contents = File.ReadAllText("XMLFile1.xml");
var doc = XDocument.Parse(contents);
var root = doc.Root;
XNamespace ns = "http://api.some.com/version/1";
var sq = root.Descendants(ns + "SalesQuotes"); //return null
var theQuote = root.Elements(ns + "SalesQuote")
.Where(el => el.Element(ns + "Guid").Value == "825634b9-28f5-4aa7-98e7-5e4a4ed6bc6a"); //return null
var theAlternativeQuote =
from el in doc.Descendants(ns + "SalesQuote").Elements(ns + "Guid")
where el.Value == "825634b9-28f5-4aa7-98e7-5e4a4ed6bc6a"
select el; //return null

If you are not too concerned about keeping your current implementation, you could consider using a Typed DataSet and load your XML into fully typed, structured objects.
Querying those objects with Linq will be more straight forward than what I see in your current implementation.
You might also find this useful:
SO Question: Deserialize XML Document to Objects

yap, you're missing the namespace that you can grab with document.Root.GetDefaultNamespace()
// Load
var document = XDocument.Parse(xml);
var xmlns = document.Root.GetDefaultNamespace();
// Find
var query = from element in document
.Descendants(xmlns + "SalesQuote")
.Elements(xmlns + "Guid")
where element.Value == "825634b9-28f5-4aa7-98e7-5e4a4ed6bc6a"
select element;

How to get the String of a XML node in C#

enter code herein the XML document :
<foo>
<bar><para> test </para> </bar>
<bar>text</bar>
<bar>stackoverflow</bar>
</foo>
I am trying to parse it and only get the Strings in bar; by using this way:
[function where node is the foo]
foreach (XmlNode subNode in node.ChildNodes)
{
if (subNode.Name == "bar")
{
if (!String.IsNullOrWhiteSpace(subNode.InnerText))
Debug.WriteLine(subNode.Name + " - " subNode.InnerText);
}
}
However it gives me test
Thanks

This is what you are looking for (EDITTED based on you updated question)
XDocument doc = XDocument.Load(path to your xml file);
XNamespace ns = "http://docbook.org/ns/docbook";
var result = doc.Root.Descendants(ns + "para")
.Where(x => x.FirstNode.NodeType == System.Xml.XmlNodeType.Text)
.Select(x => x.Value)
.ToList();
In your updated xml I see you are using a namespace so the name of your node is not para but it's theNameSpace + "para". The namespace is defined in the first line of your xml file. Also you can see this sample too.

Do you want "test"? Try following :
string input =
"<foo>" +
"<bar><para> test </para> </bar>" +
"<bar>text</bar>" +
"<bar>stackoverflow</bar>" +
"</foo>";
XDocument doc = XDocument.Parse(input);
List<string> bars = doc.Descendants("bar").Where(x => x.NextNode != null).Select(x => (string)((XElement)x.NextNode)).ToList();

Inserting and removing nodes from an XML namespace

I'm trying to replace a node's name but I'm getting the following error "The reference node is not a child of this node". I think I know why this is happening but can't seem to work around this problem. Here is the XML:
<payload:Query1 xmlns="" xmlns:payload="" xmlns:xsi="" xsi:schemaLocation="">
<payload:QueryId>stuff</payload:QueryId>
<payload:Data>more stuff</payload:Data>
</payload:Query1>
And here is the C# bit:
doc.Load(readStream);
nsmgr = new XmlNamespaceManager(doc.NameTable);
nsmgr.AddNamespace("payload", "location");
XmlNode Query1 = doc.SelectSingleNode("//payload:Query1", nsmgr);
public XmlDocument sendReply(args)
{
XmlNode newNode = doc.CreateElement("payload:EditedQuery");
Query.InsertBefore(newNode, Query1);
Query.RemoveChild(Query1);
return doc;
}
I'm trying to replace "Query" with "EditedQuery" but his doesn't work.

If you can use .Net 3.5 LINQ to XML,
XElement root = XElement.Load(readStream);
XNamespace ns = "http://somewhere.com";
XElement Query1 = root.Descendants(ns + "Query1").FirstOrDefault();
// should check for null first on Query1...
Query1.ReplaceWith(new XElement(ns + "EditedQuery"));
Or, if you don't know the namespace, or don't want to hard-code it:
XElement root = XElement.Load(readStream);
XElement Query1 = root.Descendants()
.FirstOrDefault(x => x.Name.Localname == "Query1");
// should check for null first on Query1...
Query1.ReplaceWith(new XElement(Query1.Name.Namespace + "EditedQuery"));
See Jon Skeet's reason why to use LINQ to XML here over older API's.

Reader Nodes from XML

I have this XML and i try to read the scpefic nodes but not work =(
the my code is:
XmlDocument doc = new XmlDocument();
doc.Load("https://apps.db.ripe.net/whois/search.xml?query-string=193.200.150.125&source=ripe");
XmlNode node = doc.SelectSingleNode("/whois-resources/objects/attributes/descr");
MessageBox.Show(node.InnerText);
the two circled values on image
Url: https://apps.db.ripe.net/whois/search.xml?query-string=193.200.150.125&source=ripe
it is possible?

When you are looking for a node which has an attribute "name" set to a particular value, you need to use different syntax.
You're looking for something like:
XmlNode node = doc.SelectSingleNode("/whois-resources/objects/object/attributes/attribute[#name=\"descr\"]");
XmlAttribute attrib = node.Attributes["value"];
MessageBox.Show(attrib.Value);
This will select your second node example, get the value of the value attribute, and display it.

How about using Linq To Xml?
var xDoc = XDocument.Load("https://apps.db.ripe.net/whois/search.xml?query-string=193.200.150.125&source=ripe");
var desc = xDoc.Descendants("attribute")
.Where(a => (string)a.Attribute("name") == "descr")
.Select(a => a.Attribute("value").Value)
.ToList();
or
var desc = xDoc.XPathSelectElements("//attribute[#name='descr']")
.Select(a => a.Attribute("value").Value)
.ToList();

Select Node Type From XML document

Hi i have a scenario where i want to search the node in xml file and identify the type of file.
XDocument xDococumnetObj = XDocument.Load(filePath);
XElement presentationElement=
xDococumnetObj.Descendants()
.Where(x => x.Name.LocalName.Equals("collegge"))
.FirstOrDefault();
I have written query which returns me collegge node. But i just want to identify the type of document it is. I want to identify the document whether it contains {"Collegge","University","Company","Banking"} in single query and return its Type only.

string[] docTypes = {"Collegge", "University", "Company", "Banking"};
XDocument xdoc = XDocument.Load(filePath);
var docType = docTypes.FirstOrDefault(type =>
xdoc.Descendants().Any(n => n.Name.LocalName == type.ToLower()));
UPDATE: If all elements declared in same namespace, you can use following code to avoid traversing all elements from files
string[] docTypes = {"Collegge", "University", "Company", "Banking"};
XDocument xdoc = XDocument.Load(filePath);
XNamespace ns = "http://www.foo.org/2013/bar";
var docType = docTypes.FirstOrDefault(type => xdoc.Descendants(ns + type).Any());