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Get IPublishedContent To XDocument

I am new to the umbraco world. I am uploading an xml file using umbraco. I have a method that parses xml document on the backend using
System.Xml.Linq.
I am trying to get that file into an XDocument.
On the front end I have the following call that returns data
IPublishedContent doc = Umbraco.Media(CurrentPage.XMLfile);
but I dont know how to get that into a format that I can parse.

You can use TypedMedia method to have strongly typed object and use it's properties to retrieve / load file (e.g. from URL where it's stored inside the filesystem on your server).
Check: https://our.umbraco.org/documentation/getting-started/backoffice/property-editors/built-in-property-editors/media-picker and then use your preferred way to load up XML document from specific location.
It will look like e.g (untested, but should point you in the right direction):
var typedDocument = Umbraco.Media(CurrentPage.XMLfile);
if(typedDocument != null) {
XmlDocument doc = new XmlDocument();
doc.Load(Server.MapPath(typedDocument.Url));
// ... do whatever you want with your doc
}

How to change the data within elements in a XML file using C#?

I'm kind of new to XML files in C# ASP.NET. I have a XML in the below format:
<?xml version="1.0" encoding="utf-8" standalone="yes"?>
<Installation>
<ServerIP>192.168.20.110</ServerIP>
<DB_Name>USTCKT1</DB_Name>
<Username>jorame</Username>
<Password>Cru$%e20</Password>
<Table_PreFix>TCK</Table_PreFix>
</Installation>
I need to change the values within each element. For example, when an user clicks I should be able to replace 192.168.20.110 with 192.168.1.12.
How can I accomplish this? Any help will be really appreciated.

You should look at using the methods in the XDocument class. http://msdn.microsoft.com/en-us/library/bb301598.aspx
Specifically look at the methods: Load(string) - to load an XML file, Element() - to access a specific element and Save(string) - to save the XML document. The page on Element() has some sample code which can help.
http://msdn.microsoft.com/en-us/library/system.xml.linq.xcontainer.element.aspx

You can do something like this using the XDocument class:
XDocument doc = XDocument.Load(file.xml);
doc.Element("Installation").Element("ServerIP").Value = "192.168.1.12";
//Update the rest of the elements
doc.Save(file.xml);
More Details
If you run into namespace issues when selecting your elements you will need to include the xml namespace in the XElement selectors eg doc.Element(namspace + "Installation")

In general, you can do it in the following steps:
Create a new XmlDocument object and load the content. The content might be a file or string.
Find the element that you want to modify. If the structure of your xml file is too complex, you can use xpath you find what you want.
Apply your modification to that element.
Update your xml file.
Here is a simple demo:
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load("file.xml"); // use LoadXml(string xml) to load xml string
string path = "/Installation/ServerIP";
XmlNode node = xmlDoc.SelectSingleNode(path); // use xpath to find a node
node.InnerText = "192.168.1.12"; // update node, replace the inner text
xmlDoc.Save("file.xml"); // save updated content
Hope it's helpful.

Parsing web pages via C#, XmlDocument.LoadXml

I'm trying to download a web page and parse it. I need to reach every node of html document. So I used WebClient to download, which works perfectly. Then I use following code segment to parse the document:
WebClient client = new WebClient();
Stream data = client.OpenRead("http://web.cs.hacettepe.edu.tr/~bil339/");
StreamReader reader = new StreamReader(data);
string xml = reader.ReadToEnd();
data.Close();
reader.Close();
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.loadXml(xml);
In last line, program waits for some time, then crashes. It says there are errors in HTML code, this wasn't expected, that shouldn't be here, etc.
Any suggestions to fix this? Other techniques to parse HTML code are welcome (In C#, of course.)

Use the HTMLAgilityPack to parse HTML. Well-formed HTML is not XML and can't be parsed as such. For instance, it lacks the <?xml version="1.0" encoding="UTF-8"?> preamble that all XML files require. The HTML Agility Pack is more forgiving.

How can I correct the code to read a xml file?

This code works as it is but when I reference an external xml file in doc.Loadxml, it stops working. How can I get it to work? I don't quite understand.
I use this to call GetXmlData and provide source for the gridview :GridView1.ItemsSource = GetXmlData();
private static object GetXmlData()
{
XmlDocument doc = new XmlDocument();
doc.LoadXml(#"<?xml version=""1.0"" encoding=""utf-8"" ?>
<Products>
<Product>
<ID>1</ID>
<Name>ASP.NET</Name>
</Product>
</Products>
");
XmlDataProvider provider = new XmlDataProvider();
provider.IsAsynchronous = false;
provider.Document = doc;
provider.XPath = "Products/Product";
return new ObservableCollection<XmlNode>((IEnumerable<XmlNode>)provider.Data);
}

You need
doc.Load(fileName);
instead of
doc.LoadXml(xml);

XMLDocument has several Load methods, see them with their description:
Load(Stream) Loads the XML document from the specified stream.
Load(String) Loads the XML document from the specified URL.
Load(TextReader) Loads the XML document from the specified TextReader.
Load(XmlReader) Loads the XML document from the specified XmlReader.
LoadXml(string) Loads the XML document from the specified string.
You're using the last one which is as described used to load XML from a string.
Since you need to load the XML from a file, so you've to use to Load method, as opposed to LoadXml. I think second method is better suited for your situation. You can pass the fullpath of the XML file.

This should help you:
XmlDocument doc = new XmlDocument();
doc.Load(file_path);
The method you are calling only loads xml from a string. You need to read it from a file which requires a different method.

XML Illegal Characters in path

I am querying a soap based service and wish to analyze the XML returned however when I try to load the XML into an XDoc in order to query the data. am getting an 'illegal characters in path' error message? This (below) is the XML returned from the service. I simply want to get the list of competitions and put them into a List I have setup. The XML does load into an XML Document though so must be correctly formatted?.
Any advice on the best way to do this and get round the error would be greatly appreciated.
<?xml version="1.0" ?>
- <gsmrs version="2.0" sport="soccer" lang="en" last_generated="2010-08-27 20:40:05">
- <method method_id="3" name="get_competitions">
<parameter name="area_id" value="1" />
<parameter name="authorized" value="yes" />
<parameter name="lang" value="en" />
</method>
<competition competition_id="11" name="2. Bundesliga" soccertype="default" teamtype="default" display_order="20" type="club" area_id="80" last_updated="2010-08-27 19:53:14" area_name="Germany" countrycode="DEU" />
</gsmrs>
Here is my code, I need to be able to query the data in an XDoc:
string theXml = myGSM.get_competitions("", "", 1, "en", "yes");
XmlDocument myDoc = new XmlDocument();
MyDoc.LoadXml(theXml);
XDocument xDoc = XDocument.Load(myDoc.InnerXml);

You don't show your source code, however I guess what you are doing is this:
string xml = ... retrieve ...;
XmlDocument doc = new XmlDocument();
doc.Load(xml); // error thrown here
The Load method expects a file name not an XML itself. To load an actual XML, just use the LoadXml method:
... same code ...
doc.LoadXml(xml);
Similarly, using XDocument the Load(string) method expects a filename, not an actual XML. However, there's no LoadXml method, so the correct way of loading the XML from a string is like this:
string xml = ... retrieve ...;
XDocument doc;
using (StringReader s = new StringReader(xml))
{
doc = XDocument.Load(s);
}
As a matter of fact when developing anything, it's a very good idea to pay attention to the semantics (meaning) of parameters not just their types. When the type of a parameter is a string it doesn't mean one can feed in just anything that is a string.
Also in respect to your updated question, it makes no sense to use XmlDocument and XDocument at the same time. Choose one or the another.

Following up on Ondrej Tucny's answer :
If you would like to use an xml string instead, you can use an XElement, and call the "parse" method. (Since for your needs, XElement and XDocument would meet your needs)
For example ;
string theXML = '... get something xml-ish...';
XElement xEle = XElement.Parse(theXML);
// do something with your XElement
The XElement's Parse method lets you pass in an XML string, while the Load method needs a file name.

Why not
XDocument.Parse(theXml);
I assume this will be the right solution

If this is really your output it is illegal XML because of the minus characters ('-'). I suspect that you have cut and pasted this from a browser such as IE. You must show the exact XML from a text editor, not a browser.