I am now learning [`XmlDocument`][1] but I&#39;ve just ran into [`XDocument`][2] and when I try to search the difference or benefits of them I can&#39;t find something useful, could you please tell me why you would use one over another ?


  [1]: http://msdn.microsoft.com/en-us/library/system.xml.xmldocument.aspx
  [2]: http://msdn.microsoft.com/en-us/library/system.xml.linq.xdocument.aspx

XDocument or XmlDocument

I&#39;m working on a little something and I am trying to figure out whether I can load an XDocument from a string. `XDocument.Load()` seems to take the string passed to it as a path to a physical XML file.

I want to try and bypass the step of first having to create the physical XML file and jump straight to populating the XDocument.

Any ideas?

Populate XDocument from String

I got this XML file:

	&lt;root&gt;
		&lt;level1 name=&quot;A&quot;&gt;
			&lt;level2 name=&quot;A1&quot; /&gt;
			&lt;level2 name=&quot;A2&quot; /&gt;
		&lt;/level1&gt;
		&lt;level1 name=&quot;B&quot;&gt;
			&lt;level2 name=&quot;B1&quot; /&gt;
			&lt;level2 name=&quot;B2&quot; /&gt;
		&lt;/level1&gt;
		&lt;level1 name=&quot;C&quot; /&gt;
	&lt;/root&gt;

Could someone give me a C# code using LINQ, the simplest way to print this result:&lt;br&gt;
(Note the extra space if it is a `level2` node)

    A
      A1
      A2
    B
      B1
      B2
    C

Currently I got this code:

	XDocument xdoc = XDocument.Load(&quot;data.xml&quot;));
	var lv1s = from lv1 in xdoc.Descendants(&quot;level1&quot;)
			   select lv1.Attribute(&quot;name&quot;).Value;

	foreach (var lv1 in lv1s)
	{
		result.AppendLine(lv1);

		var lv2s = from lv2 in xdoc...???
	}


LINQ to read XML

It&#39;s a very simple problem that I have. I use XDocument to generate an XML file. I then want to return it as a XmlDocument class.
And I have an XmlDocument variable which I need to convert back to XDocument to append more nodes.

So, what is the *most efficient* method to convert XML between XDocument and XmlDocument? (Without using any temporary storage in a file.)

Converting XDocument to XmlDocument and vice versa

I have came across both these keywords in the VS IntelliSense. I tried to googling the difference between them and did not get a clear answer. Which one of these have the best performance with small to medium XML files. Thanks

What is the difference between Linq to XML Descendants and Elements

I&#39;m switching my code form XML to JSON. 

But I can&#39;t find how to get a JSON string from a given URL. 

The URL is something like this: &quot;https://api.facebook.com/method/fql.query?query=.....&amp;format=json&quot;

I used XDocuments before, there I could use the load method:

    XDocument doc = XDocument.load(&quot;URL&quot;);

What is the equivalent of this method for JSON? I&#39;m using JSON.NET.

How to get a JSON string from URL?

I have an `XDocument` object. I want to query for elements with a particular name at any depth using LINQ.

When I use `Descendants(&quot;element_name&quot;)`, I only get elements that are direct children of the current level. I&#39;m looking for the equivalent of &quot;//element_name&quot; in XPath...should I just use `XPath`, or is there a way to do it using LINQ methods?


Query an XDocument for elements by name at any depth

I have this code:

    XElement EcnAdminConf = new XElement(&quot;Type&quot;,
        new XElement(&quot;Connections&quot;,
        new XElement(&quot;Conn&quot;),
        // Conn.SetAttributeValue(&quot;Server&quot;, comboBox1.Text);
        // Conn.SetAttributeValue(&quot;DataBase&quot;, comboBox2.Text))),
        new XElement(&quot;UDLFiles&quot;)));
        // Conn.

How do I add attributes to `Conn`? I want to add the attributes I marked as comments, but if I try to set the attributes on `Conn` after defining `EcnAdminConf`, they are not visible.

I want to set them somehow so the XML looks like this:

    &lt;Type&gt;
      &lt;Connections&gt;
        &lt;Conn ServerName=&quot;FAXSERVER\SQLEXPRESS&quot; DataBase=&quot;SPM_483000&quot; /&gt; 
        &lt;Conn ServerName=&quot;FAXSERVER\SQLEXPRESS&quot; DataBase=&quot;SPM_483000&quot; /&gt; 
      &lt;/Connections&gt;
      &lt;UDLFiles /&gt; 
    &lt;/Type&gt;

How to put attributes via XElement

There is a similar question, but it seems that the solution didn&#39;t work out in my case: [https://stackoverflow.com/questions/3715936/weirdness-with-xdocument-xpath-and-namespaces][1]

Here is the XML I am working with:

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;Report Id=&quot;ID1&quot; Type=&quot;Demo Report&quot; Created=&quot;2011-01-01T01:01:01+11:00&quot; Culture=&quot;en&quot; xmlns=&quot;http://demo.com/2011/demo-schema&quot;&gt;
        &lt;ReportInfo&gt;
            &lt;Name&gt;Demo Report&lt;/Name&gt;
            &lt;CreatedBy&gt;Unit Test&lt;/CreatedBy&gt;
        &lt;/ReportInfo&gt;
    &lt;/Report&gt;


And below is the code that I thought it should be working but it didn&#39;t...

    XDocument xdoc = XDocument.Load(@&quot;C:\SampleXML.xml&quot;);
    XmlNamespaceManager xnm = new XmlNamespaceManager(new NameTable()); 
    xnm.AddNamespace(String.Empty, &quot;http://demo.com/2011/demo-schema&quot;);
    Console.WriteLine(xdoc.XPathSelectElement(&quot;/Report/ReportInfo/Name&quot;, xnm) == null);

Does anyone have any ideas?
Thanks.

  [1]: https://stackoverflow.com/questions/3715936/weirdness-with-xdocument-xpath-and-namespaces



how to use XPath with XDocument?

Is there any way to get the xml encoding in the toString() Function?

**Example:**

    xml.Save(&quot;myfile.xml&quot;);

leads to

    &lt;?xml version=&quot;1.0&quot; encoding=&quot;utf-8&quot;?&gt;
    &lt;Cooperations&gt;
      &lt;Cooperation&gt;
        &lt;CooperationId&gt;xxx&lt;/CooperationId&gt;
        &lt;CooperationName&gt;Allianz Konzern&lt;/CooperationName&gt;
        &lt;LogicalCustomers&gt;

But 

    tb_output.Text = xml.toString();


leads to an output like this

    &lt;Cooperations&gt;
      &lt;Cooperation&gt;
        &lt;CooperationId&gt;xxx&lt;/CooperationId&gt;
        &lt;CooperationName&gt;Allianz Konzern&lt;/CooperationName&gt;
        &lt;LogicalCustomers&gt;
        ...

XDocument.ToString() drops XML Encoding Tag

I have a `List&lt;string&gt;` &quot;sampleList&quot; which contains

    Data1
    Data2
    Data3...

The file structure is like

    &lt;file&gt;
       &lt;name filename=&quot;sample&quot;/&gt;
       &lt;date modified =&quot;  &quot;/&gt;
       &lt;info&gt;
         &lt;data value=&quot;Data1&quot;/&gt; 
         &lt;data value=&quot;Data2&quot;/&gt;
         &lt;data value=&quot;Data3&quot;/&gt;
       &lt;/info&gt;
    &lt;/file&gt;


I&#39;m currently using XmlDocument to do this. 

Example:

    List&lt;string&gt; lst;
    XmlDocument XD = new XmlDocument();
    XmlElement root = XD.CreateElement(&quot;file&quot;);
    XmlElement nm = XD.CreateElement(&quot;name&quot;);
    nm.SetAttribute(&quot;filename&quot;, &quot;Sample&quot;);
    root.AppendChild(nm);
    XmlElement date = XD.CreateElement(&quot;date&quot;);
    date.SetAttribute(&quot;modified&quot;, DateTime.Now.ToString());
    root.AppendChild(date);
    XmlElement info = XD.CreateElement(&quot;info&quot;);
    for (int i = 0; i &lt; lst.Count; i++) 
    {
        XmlElement da = XD.CreateElement(&quot;data&quot;);
        da.SetAttribute(&quot;value&quot;,lst[i]);
        info.AppendChild(da);
    }
    root.AppendChild(info);
    XD.AppendChild(root);
    XD.Save(&quot;Sample.xml&quot;);

How can I create the same XML structure using XDocument?

XML file creation using XDocument in C#

I want to make a deep copy of a LINQ to XML XElement.  The reason I want to do this is there are some nodes in the document that I want to create modified copies of (in the same document).  I don&#39;t see a method to do this.

I could convert the element to an XML string and then reparse it, but I&#39;m wondering if there&#39;s a better way.

How do I do a deep copy of an element in LINQ to XML?

I have an xml file that contains its element like 

    &lt;ab:test&gt;Str&lt;/ab:test&gt;  

When I am trying to access it using the code:

    XElement tempElement = doc.Descendants(XName.Get(&quot;ab:test&quot;)).FirstOrDefault();


It&#39;s giving me this error:

&gt;System.Web.Services.Protocols.SoapException: Server was unable to process request. ---&gt; System.Xml.XmlException: The &#39;:&#39; character, hexadecimal value 0x3A, cannot be included in a name.

How should I access it?

The &#39;:&#39; character, hexadecimal value 0x3A, cannot be included in a name

Consider the following XML:

    &lt;response&gt;
      &lt;status_code&gt;200&lt;/status_code&gt;
      &lt;status_txt&gt;OK&lt;/status_txt&gt;
      &lt;data&gt;
        &lt;url&gt;http://bit.ly/b47LVi&lt;/url&gt;
        &lt;hash&gt;b47LVi&lt;/hash&gt;
        &lt;global_hash&gt;9EJa3m&lt;/global_hash&gt;
        &lt;long_url&gt;http://www.tumblr.com/docs/en/api#api_write&lt;/long_url&gt;
        &lt;new_hash&gt;0&lt;/new_hash&gt;
      &lt;/data&gt;
    &lt;/response&gt;

I&#39;m looking for a really short way to get just the value of the `&lt;hash&gt;` element. I tried:

    var hash = xml.Element(&quot;hash&quot;).Value;
But that&#39;s not working. Is it possible to provide an XPath query to an `XElement`? I can do it with the older `System.Xml` framework, doing something like:

    xml.Node(&quot;/response/data/hash&quot;).Value
Is there something like this in a LINQ namespace?


----------

UPDATE:

After monkeying around with this some more I found a way to do what I&#39;m trying to do:

    var hash = xml.Descendants(&quot;hash&quot;).FirstOrDefault().Value;

I&#39;d still be interested to see if anyone has a better solution?


How to use XPath with XElement or LINQ?

I am new to LINQ to XML. After you have built `XDocument`, how do you get the `OuterXml` of it like you did with `XmlDocument`?

How to get Xml as string from XDocument?

Is there a way to search an XDocument without knowing the namespace? I have a process that logs all SOAP requests and encrypts the sensitive data.  I want to find any elements based on name.  Something like, give me all elements where the name is CreditCard. I don&#39;t care what the namespace is.

My problem seems to be with LINQ and requiring a xml namespace.

I have other processes that retrieve values from XML, but I know the namespace for these other process.

    XDocument xDocument = XDocument.Load(@&quot;C:\temp\Packet.xml&quot;);
    XNamespace xNamespace = &quot;http://CompanyName.AppName.Service.Contracts&quot;;

    var elements = xDocument.Root
                            .DescendantsAndSelf()
                            .Elements()
                            .Where(d =&gt; d.Name == xNamespace + &quot;CreditCardNumber&quot;);

I really want to have the ability to search xml without knowing about namespaces, something like this:

    XDocument xDocument = XDocument.Load(@&quot;C:\temp\Packet.xml&quot;);
    var elements = xDocument.Root
                            .DescendantsAndSelf()
                            .Elements()
                            .Where(d =&gt; d.Name == &quot;CreditCardNumber&quot;)

This will not work because I don&#39;t know the namespace beforehand at compile time.

How can this be done?

    &lt;s:Envelope xmlns:s=&quot;http://schemas.xmlsoap.org/soap/envelope/&quot;&gt;
	&lt;s:Body xmlns:xsi=&quot;http://www.w3.org/2001/XMLSchema-instance&quot; xmlns:xsd=&quot;http://www.w3.org/2001/XMLSchema&quot;&gt;
		&lt;Request xmlns=&quot;http://CompanyName.AppName.Service.ContractA&quot;&gt;
			&lt;Person&gt;
				&lt;CreditCardNumber&gt;83838&lt;/CreditCardNumber&gt;
				&lt;FirstName&gt;Tom&lt;/FirstName&gt;
				&lt;LastName&gt;Jackson&lt;/LastName&gt;
			&lt;/Person&gt;
			&lt;Person&gt;
				&lt;CreditCardNumber&gt;789875&lt;/CreditCardNumber&gt;
				&lt;FirstName&gt;Chris&lt;/FirstName&gt;
				&lt;LastName&gt;Smith&lt;/LastName&gt;
			&lt;/Person&gt;
			...
			
    &lt;s:Envelope xmlns:s=&quot;http://schemas.xmlsoap.org/soap/envelope/&quot;&gt;
	&lt;s:Body xmlns:xsi=&quot;http://www.w3.org/2001/XMLSchema-instance&quot; xmlns:xsd=&quot;http://www.w3.org/2001/XMLSchema&quot;&gt;
		&lt;Request xmlns=&quot;http://CompanyName.AppName.Service.ContractsB&quot;&gt;
			&lt;Transaction&gt;
				&lt;CreditCardNumber&gt;83838&lt;/CreditCardNumber&gt;
				&lt;TransactionID&gt;64588&lt;/FirstName&gt;
			&lt;/Transaction&gt;		
			...


Search XDocument using LINQ without knowing the namespace

How do I get just the children of an XElement?

I am currently using the XElement.Descendants() function, which returns all levels of XElements, rather than just the child nodes.

What I would really like is an IEnumerable&lt;XElement&gt; of just the children.

Children of XElement

Is there any way to have an XDocument print the xml version when using the ToString method? Have it output something like this:

&lt;pre&gt;&lt;code&gt;&amp;lt;?xml version=&quot;1.0&quot;?&amp;gt;
&amp;lt;!DOCTYPE ELMResponse [
]&amp;gt;
&amp;lt;Response&amp;gt;
&amp;lt;Error&amp;gt; ...&lt;/code&gt;&lt;/pre&gt;

I have the following:

&lt;pre&gt;&lt;code&gt;var xdoc = new XDocument(new XDocumentType(&quot;Response&quot;, null, null, &quot;\n&quot;), ...&lt;/code&gt;&lt;/pre&gt;

which will print this which is fine, but it is missing the &quot;&amp;lt;?xml version&quot; as stated above.

&lt;pre&gt;&lt;code&gt;&amp;lt;!DOCTYPE ELMResponse [
]&amp;gt;
&amp;lt;Response&amp;gt;
&amp;lt;Error&amp;gt; ...&lt;/code&gt;&lt;/pre&gt;

I know that you can do this by outputting it manually my self. Just wanted to know if it was possible by using XDocument.

How to print &lt;?xml version=&quot;1.0&quot;?&gt; using XDocument

How can I change an attribute of an element in an XML file, using C#?

How to change XML Attribute

I have a simple XML

    &lt;AllBands&gt;
      &lt;Band&gt;
        &lt;Beatles ID=&quot;1234&quot; started=&quot;1962&quot;&gt;greatest Band&lt;![CDATA[lalala]]&gt;&lt;/Beatles&gt;
        &lt;Last&gt;1&lt;/Last&gt;
        &lt;Salary&gt;2&lt;/Salary&gt;
      &lt;/Band&gt;
      &lt;Band&gt;
        &lt;Doors ID=&quot;222&quot; started=&quot;1968&quot;&gt;regular Band&lt;![CDATA[lalala]]&gt;&lt;/Doors&gt;
        &lt;Last&gt;1&lt;/Last&gt;
        &lt;Salary&gt;2&lt;/Salary&gt;
      &lt;/Band&gt;
    &lt;/AllBands&gt;

However , 

when I want to reach the &quot;Doors band&quot; and to change its ID : 

      using (var stream = new StringReader(result))
                {
                    XDocument xmlFile = XDocument.Load(stream);
        
                    var query = from c in xmlFile.Elements(&quot;Band&quot;)
    
                                select c;
                                 ...

`query` **has no results**

But

If I write  `xmlFile.Elements().Elements(&quot;Band&quot;)` so it Does find it.

What is the problem ?

Is the full path from the Root needed ?

And if so , Why did it work without specify `AllBands` ?

Does the `XDocument` Navigation require me to know the full level structure down to the required element ?

Finding element in XDocument?

I have this code :

    /*string theXml =
    @&quot;&lt;Response xmlns=&quot;&quot;http://myvalue.com&quot;&quot;&gt;&lt;Result xmlns:a=&quot;&quot;http://schemas.datacontract.org/2004/07/My.Namespace&quot;&quot; xmlns:i=&quot;&quot;http://www.w3.org/2001/XMLSchema-instance&quot;&quot;&gt;&lt;a:TheBool&gt;true&lt;/a:TheBool&gt;&lt;a:TheId&gt;1&lt;/a:TheId&gt;&lt;/Result&gt;&lt;/Response&gt;&quot;;*/

    string theXml = @&quot;&lt;Response&gt;&lt;Result&gt;&lt;TheBool&gt;true&lt;/TheBool&gt;&lt;TheId&gt;1&lt;/TheId&gt;&lt;/Result&gt;&lt;/Response&gt;&quot;;

    XDocument xmlElements = XDocument.Parse(theXml);

    var elements = from data in xmlElements.Descendants(&quot;Result&quot;)
                   select new {
                                TheBool = (bool)data.Element(&quot;TheBool&quot;),
                                TheId = (int)data.Element(&quot;TheId&quot;),
                              };

    foreach (var element in elements)
    {
        Console.WriteLine(element.TheBool);
        Console.WriteLine(element.TheId);
    }

When I use the first value for theXml, the result is null, whereas with the second one, I have good values ...

How to use Linq to Xml with xmlns values ?



Use Linq to Xml with Xml namespaces

I am revising some **XHTML** files authored by another party. As part of this effort, I am doing some bulk editing via **Linq to XML**.

I&#39;ve just noticed that some of the original source XHTML files contain the [`&amp;quot;` HTML entity][1] in text nodes within those files. For instance:

&lt;!-- language: lang-html --&gt;

    &lt;p&gt;Greeting: &amp;quot;Hello, World!&amp;quot;&lt;/p&gt;

And that when recovering the XHTML text via [XElement.ToString()][2], the **`&amp;quot;`** entities are being replaced by **plain double-quotes**:

&lt;!-- language: lang-html --&gt;

    &lt;p&gt;Greeting: &quot;Hello, World!&quot;&lt;/p&gt;

**Question:** Can anyone tell me what the motivation might have been for the original author to use the `&amp;quot;` entities instead of plain double-quotes? Did those entities serve a purpose which I don&#39;t fully appreciate? Or, were they truly unnecessary as I suspect?

I do understand that **`&amp;quot;`** would be necessary in certain contexts, such as when there is a need to place a double-quote within an HTML attribute. For instance:

&lt;!-- language: lang-html --&gt;

    &lt;a href=&quot;/images/hello_world.jpg&quot; alt=&quot;Greeting: &amp;quot;Hello, World!&amp;quot;&quot;&gt;
      Greeting&lt;/a&gt;

  [1]: http://www.fileformat.info/info/unicode/char/22/index.htm
  [2]: http://msdn.microsoft.com/en-us/library/bb341005%28v=vs.110%29.aspx


Uses for the &#39;&amp;quot;&#39; entity in HTML

Here&#39;s what I&#39;m trying to do. I&#39;m querying an XML file using LINQ to XML, which gives me an IEnumerable`&lt;T`&gt; object, where T is my &quot;Village&quot; class, filled with the results of this query. Some results are duplicated, so I would like to perform a Distinct() on the IEnumerable&lt;Village&gt; object, like so:

    public IEnumerable&lt;Village&gt; GetAllAlliances()
    {
        try
        {
            IEnumerable&lt;Village&gt; alliances =
                 from alliance in xmlDoc.Elements(&quot;Village&quot;)
                 where alliance.Element(&quot;AllianceName&quot;).Value != String.Empty
                 orderby alliance.Element(&quot;AllianceName&quot;).Value
                 select new Village
                 {
                     AllianceName = alliance.Element(&quot;AllianceName&quot;).Value
                 };
                 
            // TODO: make it work...
            return alliances.Distinct(new AllianceComparer());
        }
        catch (Exception ex)
        {
            throw new Exception(&quot;GetAllAlliances&quot;, ex);
        }
    }

As the default comparer would not work for the Village object, I implemented a custom one, as seen here in the AllianceComparer class:

    public class AllianceComparer : IEqualityComparer&lt;Village&gt;
    {
        #region IEqualityComparer&lt;Village&gt; Members
        bool IEqualityComparer&lt;Village&gt;.Equals(Village x, Village y)
        {
            // Check whether the compared objects reference the same data.
            if (Object.ReferenceEquals(x, y)) 
                return true;

            // Check whether any of the compared objects is null.
            if (Object.ReferenceEquals(x, null) || Object.ReferenceEquals(y, null))
                return false;

            return x.AllianceName == y.AllianceName;
        }

        int IEqualityComparer&lt;Village&gt;.GetHashCode(Village obj)
        {
            return obj.GetHashCode();
        }
        #endregion
    }

The Distinct() method doesn&#39;t work, as I have exactly the same number of results with or without it. Another thing, and I don&#39;t know if it&#39;s usually possible, but I cannot step into AllianceComparer.Equals() to see what could be the problem.&lt;br/&gt;
I&#39;ve found examples of this on the Internet, but I can&#39;t seem to make my implementation work.

Hopefully, someone here might see what could be wrong here!
Thanks in advance!

C# Distinct on IEnumerable&lt;T&gt; with custom IEqualityComparer

I have a **Question** class that has public List property that can contain several **Answers**.

I have a question repository which is responsible for reading the questions and its answers from an xml file.

So I have a collection of Questions (List&lt;Question&gt;) with each Question object having a collection of Answers and I&#39;d like to query this collection of Questions for an Answer (ie by its Name) by using Linq. I don&#39;t know how to do this properly.

I could do it with a foreach but I&#39;d like to know whether there is a pure Linq way since I&#39;m learning it.







linq question: querying nested collections

I&#39;m generating an *utf-8 XML* file using `XDocument`.

    XDocument xml_document = new XDocument(
                        new XDeclaration(&quot;1.0&quot;, &quot;utf-8&quot;, null),
                        new XElement(ROOT_NAME,                    
                        new XAttribute(&quot;note&quot;, note)
                    )
                );
    ...
    xml_document.Save(@file_path);

The file is generated correctly and validated with an xsd file with success.

When I try to upload the XML file to an online service, the service says that my file is `wrong at line 1`; I have discovered that the problem is caused by the BOM on the first bytes of the file.

Do you know why the BOM is appended to the file and how can I save the file without it?  

As stated in [Byte order mark][1] Wikipedia article:

&gt; While Unicode standard allows BOM in
&gt; UTF-8  **it does not require or
&gt; recommend it**. Byte order has no
&gt; meaning in UTF-8 so a BOM only
&gt; serves to identify a text stream or
&gt; file as UTF-8 or that it was converted
&gt; from another format that has a BOM

Is it an `XDocument` problem or should I contact the guys of the online service provider to ask for a parser upgrade?  

  [1]: http://en.wikipedia.org/wiki/Byte_order_mark

XDocument: saving XML to file without BOM

This is when using XDocument from .net.

I thought this might work...

    xElement.Element(elementName).Value = new XCData(value).ToString();

... but it comes out like this...

    &lt;name&gt;&amp;lt;![CDATA[hello world]]&amp;gt;&lt;/name&gt;

How do I make the value of an XElement be wrapped in ![CDATA[***]]?

I can select the first customer node and change its company name with the code below.

But how do I select customer node where ID=2?

        XDocument xmldoc = new XDocument(
            new XDeclaration(&quot;1.0&quot;, &quot;utf-8&quot;, &quot;yes&quot;),
            new XComment(&quot;These are all the customers transfered from the database.&quot;),
            new XElement(&quot;Customers&quot;,
                new XElement(&quot;Customer&quot;,
                    new XAttribute(&quot;ID&quot;, 1),
                    new XElement(&quot;FullName&quot;, &quot;Jim Tester&quot;),
                    new XElement(&quot;Title&quot;, &quot;Developer&quot;),
                    new XElement(&quot;Company&quot;, &quot;Apple Inc.&quot;)
                    ),
                new XElement(&quot;Customer&quot;,
                    new XAttribute(&quot;ID&quot;, 2),
                    new XElement(&quot;FullName&quot;, &quot;John Testly&quot;),
                    new XElement(&quot;Title&quot;, &quot;Tester&quot;),
                    new XElement(&quot;Company&quot;, &quot;Google&quot;)
                    )
                )
            );

        XElement elementToChange = xmldoc.Element(&quot;Customers&quot;).Element(&quot;Customer&quot;).Element(&quot;Company&quot;);
        elementToChange.ReplaceWith(new XElement(&quot;Company&quot;, &quot;new company value...&quot;));


&lt;h2&gt;ANSWER:&lt;/h2&gt;

Thanks guys, for the record, here is the exact syntax to search out the company element in the customer-with-id-2 element, and then change only the value of the company element:

    XElement elementToChange = xmldoc.Element(&quot;Customers&quot;)
        .Elements(&quot;Customer&quot;)
        .Single(x =&gt; (int)x.Attribute(&quot;ID&quot;) == 2)
        .Element(&quot;Company&quot;);
    elementToChange.ReplaceWith(
        new XElement(&quot;Company&quot;, &quot;new company value...&quot;)
        );


&lt;h2&gt;ANSWER WITH METHOD SYNTAX:&lt;/h2&gt;

Just figured it out in method syntax as well:

    XElement elementToChange = (from c in xmldoc.Element(&quot;Customers&quot;)
                                    .Elements(&quot;Customer&quot;)
                                where (int)c.Attribute(&quot;ID&quot;) == 3
                                select c).Single().Element(&quot;Company&quot;);

All Linq to-Xml Solutions on Gang of Coders

Total of 27 Linq to-Xml Solutions