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XML Namespace prefix only on root

I am creating an XML document using the Task Factory XML Output Destination task though the output needs some tweaking and I can't seem to find a way to do this within the task so figured I would be able to do this via the script component with C#.
This is the XML I am working with
<?xml version="1.0" encoding="utf-8"?>
<CSDS xmlns="http://www.datadictionary.nhs.uk/messages/CSDS-v1-0">
<CYP000>
<C000010>1.0</C000010>
</CYP000>
</CSDS>
And I need to change the XML to look like:
<?xml version="1.0" encoding="utf-8"?>
<CSDS:CSDS xmlns:CSDS="http://www.datadictionary.nhs.uk/messages/CSDS-v1-0">
<CYP000>
<C000010>1.0</C000010>
</CYP000>
</CSDS>
I have tried creating a new XDocument declaring the namespace and adding the source elements in but this adds the namespace to all elements.
string xmlFile = #"C:\Temp\csds.xml";
string newXmlFile = #"C:\Temp\csds-new.xml";
XDocument sourceXml = XDocument.Load(xmlFile);
XNamespace ns = "http://www.datadictionary.nhs.uk/messages/CSDS-v1-0";
XDocument newXml = new XDocument(new XDeclaration("1.0", "utf-8", null));
XElement newRoot = new XElement(ns + "CSDS",
new XAttribute(XNamespace.Xmlns + "CSDS", ns.NamespaceName));
newRoot.Add(sourceXml.Root.Elements());
newRoot.Save(newXmlFile);
Output
<?xml version="1.0" encoding="utf-8"?>
<CSDS:CSDS xmlns:CSDS="http://www.datadictionary.nhs.uk/messages/CSDS-v1-0">
<CSDS:CYP000>
<CSDS:C000010>1.0</CSDS:C000010>
</CSDS:CYP000>
</CSDS:CSDS>

I have found that doing the following after loading my file works along with the rest of my code:
foreach (var descendants in sourceXml.Root.Descendants())
descendants.Name = descendants.Name.LocalName;

Issue on saving the XML file after editing it

I have an XML file with some data on it..for example
<?xml version="1.0" encoding="utf-8"?>
<CreateAndSendMessageRequest xmlns:xsi="http://www.w3.org/2001/XMLSchema-
instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns="http://schemas.communisis.com/lv">
<CompositionRequest>
<Metadata xmlns="http://lv.com/gi/si/common/CommonTypes">
<PolicyReference>250028766505DN</PolicyReference>
<AccountReference>Test1234</AccountReference>
<QuoteReference>Test3214</QuoteReference>
<OutboundTransactionID>string</OutboundTransactionID>
</Metadata>
Now i want to replace POLICY REFERENCE value with some dummy data. I am able to do that but now i have to save it as a new file with a different file name..
How can i achieve that..
For reference i am giving my code.
XmlDocument doc = new XmlDocument();
doc.Load(filepath);
XmlNodeList node = doc.GetElementsByTagName("PolicyReference");
var item =node.Item(0);
string value = item.FirstChild.Value;
string nevalue = value.Replace(value, "Test123");
doc.DocumentElement.;
doc.Save(#"C:\Test\file.xml");

The xml wasn't valid.
Anyway, this is how to make it work:
Xml file:
<?xml version="1.0" encoding="UTF-8"?>
<CreateAndSendMessageRequest>
<CompositionRequest>
<Metadata xmlns="http://lv.com/gi/si/common/CommonTypes">
<PolicyReference>250028766505DN</PolicyReference>
<AccountReference>Test1234</AccountReference>
<QuoteReference>Test3214</QuoteReference>
<OutboundTransactionID>string</OutboundTransactionID>
</Metadata>
</CompositionRequest>
</CreateAndSendMessageRequest>
Code:
XmlDocument doc = new XmlDocument();
doc.Load("bho.xml");
XmlNodeList node = doc.GetElementsByTagName("PolicyReference");
node[0].InnerText = "Test123";
doc.Save("file.xml");
Result xml:
<?xml version="1.0" encoding="UTF-8"?>
<CreateAndSendMessageRequest>
<CompositionRequest>
<Metadata xmlns="http://lv.com/gi/si/common/CommonTypes">
<PolicyReference>Test123</PolicyReference>
<AccountReference>Test1234</AccountReference>
<QuoteReference>Test3214</QuoteReference>
<OutboundTransactionID>string</OutboundTransactionID>
</Metadata>
</CompositionRequest>
</CreateAndSendMessageRequest>
Hope it helps you ^^

Using xmlwriter to custom write XML

I am trying to use xmlwriter to customize my xml file. I have tried using a class to serialize to xml but it does not seem to work. My goal is to have multiple namespace definitions within the "AddO" element, with each element under the messages having a prefix.
Click event:
XmlWriterSettings objSetting = new XmlWriterSettings();
objSetting.Indent = true;
objSetting.NewLineOnAttributes = true;
System.Text.StringBuilder sb = new System.Text.StringBuilder();
using (XmlWriter objWriter = XmlWriter.Create(sb, objSetting))
{
//Request
objWriter.WriteStartDocument();
objWriter.WriteStartElement("Request");
objWriter.WriteStartElement("SName");
objWriter.WriteValue("AocD");
objWriter.WriteEndElement();
objWriter.WriteStartElement("Message");
//objWriter.WriteStartElement("pd", "AddO", "www.google.com");
objWriter.WriteStartElement("pd", "AddO", "www.google.com");
objWriter.WriteStartElement("aoc","CaseD");
objWriter.WriteStartElement("CaseA");
objWriter.WriteStartElement("DocE");
objWriter.WriteEndElement();
objWriter.WriteEndElement();
objWriter.WriteEndElement();
objWriter.WriteEndElement();//CaseD End
objWriter.WriteEndElement();//Message End
objWriter.WriteEndElement();//Request End
objWriter.WriteEndDocument();
File.WriteAllText(Server.MapPath("~/images/test.xml"), sb.ToString());
I get this XML Result:
<?xml version="1.0" encoding="utf-16"?>
<Request>
<SName>AocD</SName>
<Message>
<iepd:AddO xmlns:iepd="www.google.com">
<aoc xmlns="CaseD">
<CaseA>
<DocE>
</DocE>
</CaseA>
</aoc>
</iepd:AddO>
</Message>
</Request>
Trying to get:
<?xml version="1.0" encoding="utf-16"?>
<Request>
<SName>AocD</SName>
<Message>
<iepd:AddO xmlns:iepd="www.google.com" xmlns:a="www.goo.com" xmlns:b="www.gle.com" xmlns:d="www.le.com">
<a:CaseD">
<b:CaseA>
<d:DocE>
</d:DocE>
</b:CaseA>
</a:CaseD>
</iepd:AddO>
</Message>
</Request>

How to write an xml attribute without replace all attributes?

I'm using this:
public void WriteSettings(string key, string value)
{
XmlWriterSettings xmlSettings = new XmlWriterSettings();
xmlSettings.Indent = true;
xmlSettings.NewLineOnAttributes = true;
XmlWriter writer = XmlWriter.Create(TMP_FULLPATH, xmlSettings);
writer.WriteStartElement("settings");
writer.WriteAttributeString(key, value);
writer.WriteEndAttribute();
writer.WriteEndDocument();
writer.Flush();
writer.Close();
}
But any modification replaces all attributes with only the last remaining attribute that I am trying to add. For example:
current XML:
<?xml version="1.0" encoding="utf-8"?>
<settings TitleFormat="name:%name% date:%date%" />
when I do:
WriteSettings("foo", "baa");
the XML is:
<?xml version="1.0" encoding="utf-8"?>
<settings foo="baa" />
instead of:
<?xml version="1.0" encoding="utf-8"?>
<settings TitleFormat="name:%name% date:%date%" foo="baa" />
How can I fix that?

You are writing a new file, with no consideration at all of the old. To update a document, you must load it into a DOM, edit the DOM, and save the DOM:
var doc = new XmlDocument();
doc.Load(path);
doc.DocumentElement.SetAttribute(key, value);
doc.Save(path);

you are creating new file each time you call XmlWriter.Create(), do something like this.

Writing To Existing XML FILE

I have a xml file, that looks something like this:
<?xml version="1.0" encoding="utf-8"?>
<Settings>
<WhereDoCopy Path="C:\Users\USER\Desktop\jobs" />
</Settings>
What can I do, to add an Element to that file?

XDocument doc = XDocument.Load("your.xml");
XElement item = new XElement(WhereDoCopy ,
new XAttribute("Path", "C:\Users\USER\Desktop\jobs2"));
doc.Root.Add(item);
http://msdn.microsoft.com/en-us/library/system.xml.linq.xdocument.aspx