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insert xml tag with c#

I'm trying to insert a XML tag in an existing xml-file. To insert an XML-Tag in C# is not really a problem, but my Problem is, that i need the new beginning-tag and the ending-tag on a certain place in that file ... can anybody help me ...
here an Example:
this is the xml-file before:
<?xml version="1.0" standalone="yes"?>
<DocumentElement>
<Item>
<ItemID>2711</ItemID>
<ItemTypeID>P</ItemTypeID>
<ColorID>1</ColorID>
</Item>
<Item>
<ItemID>64566</ItemID>
<ItemTypeID>P</ItemTypeID>
<ColorID>3</ColorID>
</Item>
</DocumentElement>
... this should be the new XML-file -> with the new tag "Inventory":
<?xml version="1.0" standalone="yes"?>
<DocumentElement>
<Inventory>
<Item>
<ItemID>2711</ItemID>
<ItemTypeID>P</ItemTypeID>
<ColorID>1</ColorID>
</Item>
<Item>
<ItemID>64566</ItemID>
<ItemTypeID>P</ItemTypeID>
<ColorID>3</ColorID>
</Item>
</Inventory>
</DocumentElement>
can anybody help me?

You can wrap the existing Items in a new XElement then replace the nodes on the original document:
XDocument doc = XDocument.Parse("<DocumentElement><Item><ItemID>2711</ItemID><ItemTypeID>P</ItemTypeID><ColorID>1</ColorID></Item><Item><ItemID>64566</ItemID><ItemTypeID>P</ItemTypeID><ColorID>3</ColorID></Item></DocumentElement>");
var items = doc.Descendants("Item");
XElement inventory = new XElement("Inventory");
inventory.Add(items);
doc.Root.ReplaceNodes(inventory);
//now you can save the XDocument to a file or whatever
Creates this:
<DocumentElement>
<Inventory>
<Item>
<ItemID>2711</ItemID>
<ItemTypeID>P</ItemTypeID>
<ColorID>1</ColorID>
</Item>
<Item>
<ItemID>64566</ItemID>
<ItemTypeID>P</ItemTypeID>
<ColorID>3</ColorID>
</Item>
</Inventory>
</DocumentElement>
If you have LINQPad you can run this script: http://share.linqpad.net/7c636x.linq

You can try this
var doc = XDocument.Load(file);
var characters = doc.Descendants("DocumentElement").FirstOrDefault();
if (characters != null)
{
XElement xe = new XElement("Inventory");
characters.Add(xe);
var oColl = doc.Descendants("Item");
xe.Add(oColl);
}
doc.Save(file);

Parse XML into String type array in Windows Phone 8 App using C#

I have an XML file, which I like to parse and get the value in a string type array. I know there are XMLSerialization namespace and other things. But what I am trying to achieve is getting the value in a string array. It may be obtained using Foreach loop or for loop.
For example, here is my XML file:
<?xml version="1.0" encoding="utf-8" ?>
<channel>
<title>Social Media</title>
<item>
<title>Facebook</title>
<link>http://www.facebook.com/</link>
</item>
<item>
<title>Twitter</title>
<link>http://www.twitter.com/</link>
</item>
<item>
<title>Google+</title>
<link>http://plus.google.com/</link>
</item>
</channel>
Now, I have two string type array as variable into a C# file.
For example:
public string[] WebsiteName;
public string[] Urls;
Now, I want to get all the values of WebsiteName into the WebsiteName array and website links into the Urls array.
Is there any way to do it? If yes, please show it to me. It will be very helpful.

Here is an example to get website names and links using LINQ:
var xml = #"<?xml version=""1.0"" encoding=""utf-8"" ?>
<channel>
<title>Social Media</title>
<item>
<title>Facebook</title>
<link>http://www.facebook.com/</link>
</item>
<item>
<title>Twitter</title>
<link>http://www.twitter.com/</link>
</item>
<item>
<title>Google+</title>
<link>http://plus.google.com/</link>
</item>
</channel>";
var doc = XDocument.Parse(xml);
WebsiteName = doc.Descendants("title").Select(o => o.Value).ToArray();
Urls = doc.Descendants("link").Select(o => o.Value).ToArray();
XDocument.Parse(xml): create XDocument from string. If you want the source is file instead of string then you can use XDocument.Load("path_to_the_xml_file").
doc.Descendants("title"): will get all tags named "title", then
.Select(o => o.Value): will get the string between the opening and closing tag, aka the value

var doc = XDocument.Parse(xml);
var WebsiteName = doc.Descendants("title").Select(o => o.Value).ToArray();
ListBox.ItemsSource = WebsiteName;
And you get content written in listbox.

XMLdocument Sort

I've figured out how to append nodes to my rss document in the right structyre. I now need to sort it in the pubDate order and then output to screen. Looking at the examples online, I've found lots of XDocument and Linq stuff but nothing with XmlDocument. Scratching my head whether to scrap what code I have and work out how to do it in XDocument with advice from here or continue with XMLDocument and figure out a way to sort.
With XMLDocument I've got the code working exactly as I want, just need my feed to be sorted in pubDate order when it spits it out to the screen. So I think I will stick with this for the timebeing. I've found this article http://support.microsoft.com/kb/555060 and an xslt someone posted in Stack Overflow, but I dont know how to call the "XmlHelperFunctions" from my code. Is XSLT the easiest option I have, or is there something easier out there?
This is my code:
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.LoadXml(rssFeed.ToString());
XmlNodeList nl = xmlDoc.SelectNodes("/rss/channel/item");
foreach (XmlNode xn in nl)
{
string title = xn["title"].InnerText;
string link = xn["link"].InnerText;
string desc = xn["description"].InnerText;
string auth = xn["author"].InnerText;
string pdate = xn["pubDate"].InnerText;
XmlElement itemnode = xmlDoc.CreateElement("item");
itemnode.InnerXml = "<title></title><link></link><description></description><author></author><pubDate></pubDate>";
itemnode["title"].InnerText = title;
itemnode["link"].InnerText = link;
itemnode["description"].InnerText = desc;
itemnode["author"].InnerText = auth;
itemnode["pubDate"].InnerText = pdate;
xmlDoc.DocumentElement.SelectNodes("/rss/channel")[0].AppendChild(itemnode);
}
// Output to screen
xmlDoc.Save(Response.Output);
my rss feed
<?xml version="1.0" encoding="utf-8"?>
<rss xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.0">
<channel>
<title>My RSS Feed</title>
<link>http://www.mylink.aspx</link>
<description>
</description>
<item>
<title>Top marks</title>
<link>http://www.mymarks.aspx</link>
<description>
<p>description field here</p>
</description>
<author>Viv</author>
<pubDate>Thu, 16 Aug 2012 12:10:54 GMT</pubDate>
</item>
<item>
<title>Costa Coffee</title>
<link>http://www.Costa.aspx</link>
<description>
<p>Costa Coffee have special offers.</p>
</description>
<author>Mike</author>
<pubDate>Thu, 23 Aug 2012 15:55:53 GMT</pubDate>
</item>
<item>
<title>Celebrate success</title>
<link>http://www.Celebrate.aspx</link>
<description>
<p>Lets all celebrate </p>
</description>
<author>Viv</author>
<pubDate>Thu, 22 Aug 2012 09:10:21 GMT</pubDate>
</item>
</channel>
</rss>

You can do this fairly quickly and painlessly using Linq to XML.
If you parse your XML using XElement.Parse(...) you can then use OrderBy or OrderByDescending functions and alter the content pretty easily.
Here is a simplified example:
XElement element = XElement.Parse(#"
<rss>
<channel>
<item title='something' pubDate='22/11/2012'/>
<item title='something2' pubDate='24/03/2012'/>
<item title='something3' pubDate='10/02/2010'/>
<item title='something4' pubDate='22/01/2011'/>
</channel>
</rss>");
var elements = element.Element("channel")
.Elements("item")
.OrderBy<XElement, DateTime>(e => DateTime.ParseExact(e.Attribute("pubDate").Value, "dd/MM/yyyy", null))
.Select(e => new XElement("item",
new XElement("title", e.Attribute("title").Value),
new XElement("pubDate", e.Attribute("pubDate").Value))); // Do transform here.
element.Element("channel").ReplaceAll(elements);
Console.Write(element.ToString());
The XML is not going to be the same as yours, but hopefully it gives you an idea of what you could do. You can just specify XElement and XAttribute objects as content for your new XML, this outputs the following:
<rss>
<channel>
<item>
<title>something3</title>
<pubDate>10/02/2010</pubDate>
</item>
<item>
<title>something4</title>
<pubDate>22/01/2011</pubDate>
</item>
<item>
<title>something2</title>
<pubDate>24/03/2012</pubDate>
</item>
<item>
<title>something</title>
<pubDate>22/11/2012</pubDate>
</item>
</channel>
</rss>
I hope this is useful.

XPathSelectElements => string representation

Hi because of a misunderstanding I want to ask my question again.
I have the following XML structure:
<?xml version="1.0" encoding="utf-8"?>
<xml>
<root>
<Item>
<taxids>
<string>330</string>
<string>374</string>
<string>723</string>
<string>1087</string>
<string>1118</string>
<string>1121</string>
</taxids>
</Item>
</root>
</xml>
I need to get all the string nodes from the xml file to a string variable.
I want to get a string like this:
<taxids><string>330</string><string>374</string><string>723</string><string>1087</string><string>1118</string><string>1121</string></taxids>
My linq to xml:
var query = from ip in doc.XPathSelectElements("xml/root/Item")
select ip.XPathSelectElement("taxids").ToString();
But I am getting the following in one row of the variable query:
"System.Xml.XPath.XPathEvaluator+<EvaluateIterator>d__0`1[System.Xml.Linq.XElement]"
Is this possible?
Thanks!

Try this:
var result = doc.Element("xml")
.Element("root")
.Element("Item")
.Element("taxids")
.ToString(SaveOptions.DisableFormatting);
// result == "<taxids><string>330</string><string>374</string> ... </taxids>"

LINQ to XML (Dynamic XML)

I have an XML file which has kind of a similar structure that you can see below:
I would like to select title and subitems using LINQ to XML. The difficulties that I have: sometimes a subitem can be just one and sometimes it can be 20 subitems, and I need to add them to List<string>.
<?xml version="1.0"?>
<items>
<item>
<title>Name of the title</title>
<subitem>Test</subitem>
<subitem1>Test</subitem1>
<subitem2>Test</subitem2>
<subitem3>Test</subitem3>
<subitem4>Test</subitem4>
<subitem5>Test</subitem5>
</item>
<item>
<title>Name of the title</title>
<subitem>Test</subitem>
<subitem1>Test</subitem1>
<subitem2>Test</subitem2>
<subitem3>Test</subitem3>
</item>
<item>
<title>Name of the title</title>
<subitem>Test</subitem>
<subitem1>Test</subitem1>
</item>
</items>

The solution, including getting the titles, is:
XDocument yourXDocument = XDocument.Load(yourXmlFilePath);
IEnumerable<Tuple<XElement, IEnumerable<XElement>>> yourSubItems =
yourXDocument.Root.Descendants()
.Where(xelem => xelem.Name == "title")
.Select(xelem => new Tuple<XElement, IEnumerable<XElement>>(xelem, xelem.Parent.Elements().Where(subelem => subelem.Name.LocalName.StartsWith("subitem")));

XDocument xdoc = XDocument.Load(path_to_xml);
var query = from i in xdoc.Descendants("item")
select new
{
Title = (string)i.Element("title"),
Subitems = i.Elements()
.Where(e => e.Name.LocalName.StartsWith("subitem"))
.Select(e => (string)e)
.ToList()
};