how to use XslCompiledTransform, XSLT in c# (server side), and how to use it with Sharepoint

scenario 1: I just want to do XSLT in server side:
in most examples on the web u'll see stuff like this:

// Load the style sheet.
XslCompiledTransform xslt = new XslCompiledTransform();

// Execute the transform and output the results to a file.
xslt.Transform("books.xml", "books.html");
now many times u'll and want to use the XmlReader and the XmlWriter classes, and there u'll start getting exceptions. The main reason is that those 2 classes really check for your XML, XSL and the output, so unless ur a goody good boy with XML-XSL its really annoying. One main example is that in my scenario I want to create a chunk of HTML but as a DIV, not a whole document, so you need to explicitly tell that to the result output.

so there r ways to continue and be a goody good boy and the only place I found good and exact info about all that is here:, THX a lot u guys there!

BUT I chose to take the 1st answer and just skip the output checks by using the Trasform method with this signature:
StringWriter resultSW = new StringWriter();
myXslTrans.Transform(xmlReader, null, resultSW);

with this signature u skip the XmlWriter checks and just write strait into the stream.

scenario 2: SharePoint: they want me to refresh the content of my DataFormWebPart with ajax (yes they r stupid, but they pay), so I want to take my XSLT from the Style Library and in my case I had my XML custom made:

string allXmlStr = string.Empty;
using (var stringWriter = new StringWriter())
using (var xmlTextWriter = XmlWriter.Create(stringWriter))
    allXmlStr = stringWriter.GetStringBuilder().ToString();

using (XmlReader xmlReader = XmlReader.Create(new StringReader(allXmlStr)))
using (StringWriter resultSW = new StringWriter())
XslCompiledTransform myXslTrans = new XslCompiledTransform();
    string xsl = SPContext.Current.Site.RootWeb.GetFileAsString("/Style%20Library/[subFolderName]/Xsl/Channels.xsl");
    using (StringReader xslSR = new StringReader(xsl))
      using (XmlReader xslReader = XmlReader.Create(xslSR))
    myXslTrans.Transform(xmlReader, null, resultSW);


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