var myXslTrans = new XslCompiledTransform();
            myXslTrans.Load("SalePage.xsl");
            XmlWriterSettings xws1 = myXslTrans.OutputSettings.Clone();
            xws1.Encoding = Encoding.UTF8;

            myXslTrans.Transform(new XPathDocument(new StreamReader(@"..\..\LP.xml", Encoding.UTF8)), XmlWriter.Create(@"LP_output.xml", xws1));
            Process.Start(@"LP_output.xml");
            return;

<?xml version="1.0" encoding="UTF-8"?>
<!--<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns="http://www.w3.org/1999/xhtml" version="1.0" >-->

  <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0">  
  
  <xsl:output method="xml" indent="yes"/>
  <xsl:template match="/POSLog">
    
  <SalePageNative>
  <SalePage>
  <xsl:for-each select="Transaction">

..........
    
  </xsl:for-each>
  </SalePage>
  </SalePageNative>
  </xsl:template>


  </xsl:stylesheet>

<?xml version="1.0" encoding="windows-1251"?>
<POSLog xmlns="http://www.nrf-arts.org/IXRetail/namespace/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <Transaction TrainingModeFlag="0">
....
  </Transaction>

</POSLog>

<POSLog xmlns="http://www.nrf-arts.org/IXRetail/namespace/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

<POSLog>