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XML Illegal Characters in path using XPathDocument to do XSL Transform in C#

I have an XML in a string that I need to actually transform to html using an xsl.
I do the transform with XslCompiledTransform. In order for this to work, I am parsing the string that contains the XML to XML using XPathDocument.
However if I try to parse the string straight to the XPathDocument, then I get the error:
Illegal Characters in path.
So I had to include a StringReader in order to be able to parse the string to the XPathDocument. (Using the solutions in the posts I linked below.)
Here is my step by step procedure:
The string is retrieved from SDL Trados Studio and it depends on the XML that is being worked on (how it was originally created and loaded for translations) the string sometimes has a BOM sometimes not. The 'xml' is actually parsed from the segments of the source and target text and the structure element. The textual elements are escaped for xml and the markup and text is joined in one string. (My separate post on the removal of the BOM is C# XPathDocument parsing string to XML with BOM.)
The the string is then parsed into an XPathDocument using a StringReader.
The transform is done with the XslCompiledTransform, using a StringBuilder and a StringWriter.
Transformed xml (now html) is saved to a file.
Here is my code:
//Recreate XML file using an extractor returns a string array
string strSourceXML = String.Join("", extractor.TextSrc);
//strip BOM
strSourceXML = strSourceXML.Substring(strSourceXML.IndexOf("<?"));
//Transform XML with the preview XSL
var xSourceDoc = new XPathDocument(strSourceXML);
//Load XSL
var xTr = new XslCompiledTransform();
var xslt = Settings.GetValue("WordPreview", "XSLTpath", "");
xTr.Load(xslt);
//Parse XML string
dynamic xSourceDoc;
using (StringReader s = new StringReader(strSourceXML))
{
xSourceDoc = new XPathDocument(s);
}
//Transform the XML
StringBuilder sb1 = new StringBuilder();
StringWriter swSource = new StringWriter(sb1);
xTr.Transform(xSourceDoc, null, swSource);
//Transformed file saved to the disk
string tmpSourceDoc = Path.GetTempFileName();
System.IO.StreamWriter writer1 = new System.IO.StreamWriter(tmpSourceDoc, false, Encoding.Unicode);
writer1.Write(sb1.ToString());
writer1.Close();
My question is: Is there a simpler way to solve it? Any suggestions to transform the string straight using the XSLT? Or if not, is there a direct way to parse a string to the XPathDocument?
I have searched over many posts on Stack Overflow such as these:
XML Illegal Characters in path
Illegal characters in path error while parsing XML in C#
Illegal characters in path when loading a string with XDocument
But none of them give me the solution to do this simpler. Any suggestion is welcome. Thanks.

Don't need the intermediate StringBuilder and StringWriter.
XsltCompiledTransform instance can immediately writes to the stream on disk.
string strSourceXML = string.Concat(extractor.TextSrc);
strSourceXML = strSourceXML.Substring(strSourceXML.IndexOf("<?"));
var xTr = new XslCompiledTransform();
var xslt = Settings.GetValue("WordPreview", "XSLTpath", "");
xTr.Load(xslt);
string tmpSourceDoc = Path.GetTempFileName();
using (var reader = new StringReader(strSourceXML))
using (var writer = new StreamWriter(tmpSourceDoc, false, Encoding.Unicode))
{
var xSourceDoc = new XPathDocument(reader);
xTr.Transform(xSourceDoc, null, writer);
}

How Can I Encode My New Xml Document?

I have a string with a XML text and i want to save it like XML. I encoded string (to "utf-8") but when i want to make XML from that - my cyrillic symbols in Value don't displayed right . What i need to do to encode my XML document ?
part of my xml :
<rev:Code>Мои данные</rev:Code>
my code:
string send = Encoding.GetEncoding("utf8").GetString(Encoding.GetEncoding("utf-8").GetBytes(send));
XmlDocument docsec = new XmlDocument();
docsec.LoadXml(send);
docsec.Save("C:\\XmlNEW.xml");
Original text :Мои данные
I see it after creating XML :Мои данные

I worked with russian textfiles before to convert them to rtf and used "Encoding.GetEncoding(1251)" for that purpose.

Problem was in Save Method because it use xml encoding, i take my answer from this : Answer
XmlDocument docsec = new XmlDocument();
docsec.LoadXml(send);
using (TextWriter writer = new StreamWriter("C:\XmlNEW.xml", false, Encoding.UTF8))
docsec.Save(writer);

convert KOI8-R xml node into unicode in c#

I have the following xml:
<root>
<text><![CDATA[ОПЕЛХМЮБЮ ОПЕГ БЗПРЪЫ ЯЕ АЮПЮАЮМ, Б ЙНИРН ЯЕ]]></text>
</root>
I know this text is generated using encoding KOI8-R (this text is displayed in my text editor only when I select this encoding when I open the xml file as text) and I would like to convert the value of this node into a string usable in c#. I can read the InnerText value of this node, but it's not what I'm expecting. Can someone show me the correct way to convert a string written with this encoding into a Unicode one?
Update
Following Jon Skeet suggestions, the solution would look like this:
Encoding encoding = Encoding.GetEncoding("KOI8-R");
XmlDocument doc2 = new XmlDocument();
using (TextReader tr = new StreamReader(outputPath, encoding))
{
doc2.Load(tr);
}

How do you have that XML? It should have an XML declaration stating which encoding it's using; otherwise it's not correct simply in XML terms. You shouldn't be worrying about encodings after you've parsed the XML. So potentially something like:
Encoding encoding = Encoding.GetEncoding("KOI8-R");
XDocument doc;
using (var reader = File.OpenText("file.xml", encoding))
{
doc = XDocument.Load(reader);
}
... but as I say, the file itself should declare the encoding.

Escaping ONLY contents of Node in XML

I have a part of code mentioned like below.
//Reading from a file and assign to the variable named "s"
string s = "<item><name> Foo </name></item>";
XmlDocument doc = new XmlDocument();
doc.LoadXml(s);
But, it stops working if the contents has characters something like "<", ">"..etc.
string s = "<item><name> Foo > Bar </name></item>";
I know, I have to escape those characters before loading but, if I do like
doc.LoadXml(System.Security.SecurityElement.Escape(s));
, the tags (< , >) are also escaped and as a result, the error occurs.
How can I solve this problem?

a tricky solution:
string s = "<item><name> Foo > Bar </name></item>";
s = Regex.Replace(s, #"<[^>]+?>", m => HttpUtility.HtmlEncode(m.Value)).Replace("<","ojlovecd").Replace(">","cdloveoj");
s = HttpUtility.HtmlDecode(s).Replace("ojlovecd", ">").Replace("cdloveoj", "<");
XmlDocument doc = new XmlDocument();
doc.LoadXml(s);

Assuming your content will never contain the characters "]]>", you can use CDATA.
string s = "<item><name><![CDATA[ Foo > Bar ]]></name></item>";
Otherwise, you'll need to html encode your special characters, and decode them before you use/display them (unless it's in a browser).
string s = "<item><name> Foo > Bar </name></item>";

Assign the content of string to the InnerXml property of node.
var node = doc.CreateElement("root");
node.InnerXml = s;
Take a look at - Different ways how to escape an XML string in C#

It looks like the strings that you have generated are strings, and not valid XML. You can either get the strings generated as valid XML OR if you know that the strings are always going to be the name, then don't include the XML <item> and <name> tags in the data.
Then when you create the XMLDocument. do a CreateElement and assign your string before resaving the results.
XmlDocument doc = new XmlDocument();
XmlElement root = doc.CreateElement("item");
doc.AppendChild(root);
XmlElement name = doc.CreateElement("name");
name.InnerText = "the contents from your file";
root.AppendChild(name);

In C#, how do I convert a XmlNode to string, with indentation? (Without looping)

This has got to be such a simple question but I just can't get the answer.
I have an XmlNode and all I want to do is output this node, as a string, with indentations (tabs or spaces) intact to provide better readability.
So far I tried XmlWriter, XmlTextWriter, XmlDocument, XmlReader.
I tried the PreserveWhitespace in XmlDocument but I couldn't get the XmlDocument to output my node.
I tried the Formatting = Formatting.Indented property in XmlTextWriter but I couldn't figure out how to output the contents to string.
To output the XmlNode as string WITHOUT indentation is easy. I just do XmlNode.OuterXml. How do I get the indentations in there?
I want to do this without looping through the XmlNode and using brute force to add whitespace, because I think there should be a simpler way.
Thanks.
Edit: For future readers, here is the answer:
var xmlNode = is some object of type XmlNode
using (var sw = new StringWriter())
{
using (var xw = new XmlTextWriter(sw))
{
xw.Formatting = Formatting.Indented;
xw.Indentation = 2; //default is 1. I used 2 to make the indents larger.
xmlNode.WriteTo(xw);
}
return sw.ToString(); //The node, as a string, with indents!
}
The reason I needed to do this was output the node's xml with syntax highlighting. I used AvalonEdit to highlight the xml, outputted the highlighted text to html, then converted the html to a FlowDocument which could be displayed in a RichTextBox.

You were on the right path with the XMLTextWriter, you simply need to use a StringWriter as the base stream. Here are a few good answers on how this is accomplished. Pay particular attention to the second answer, if your encoding needs to be UTF-8.
Edit:
If you need to do this in multiple places, it is trivial to write an extension method to overload a ToString() on XmlNode:
public static class MyExtensions
{
public static string ToString(this System.Xml.XmlNode node, int indentation)
{
using (var sw = new System.IO.StringWriter())
{
using (var xw = new System.Xml.XmlTextWriter(sw))
{
xw.Formatting = System.Xml.Formatting.Indented;
xw.Indentation = indentation;
node.WriteContentTo(xw);
}
return sw.ToString();
}
}
}

If you don't care about memory or performance, the simplest thing is:
XElement.Parse(xmlNode.OuterXml).ToString()