How to sort data, inside the XML file, by using XSLT

I am trying to sort the xml file's <Name> with XSLT but no luck so far.
Using Windows Application, not Web one.  The form has two datagrids--one for Planet,
another one for PlanetData.  One button for XSLT.  Other buttons for
loading/saving xml file's data.

------

[Planets.xml]

<?xml version="1.0" encoding="UTF-8" ?>
<Planets>
      <Planet>
            <NameID>01</NameID>
            <Name>Mercury</Name>
      </Planet>
      <Planet>
            <NameID>02</NameID>
            <Name>Venus</Name>
      </Planet>
      <Planet>
            <NameID>03</NameID>
            <Name>Earth</Name>
      </Planet>

      <PlanetData>
            <DataID>001</DataID>
            <Mass>0.0553(Earth = 1)</Mass>
            <NameID>01</NameID>
      </PlanetData>
      <PlanetData>
            <DataID>002</DataID>
            <Mass>0.815(Earth = 1)</Mass>
            <NameID>02</NameID>
      </PlanetData>
      <PlanetData>
            <DataID>003</DataID>
            <Mass>1.0(Earth = 1)</Mass>
            <NameID>03</NameID>
      </PlanetData>
</Planets>

-------

[PlanetSort.xslt] (I dont know if these codes are incorrect...)

<?xml version="1.0" encoding="UTF-8" ?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
      <xsl:template match="Planets">
            <xsl:apply-templates>
            <xsl:sort select="Name"/>
            </xsl:apply-templates>
      </xsl:template>
</xsl:stylesheet>

-------

I have some difficulties trying to write codes for the XSLT button. I cannot
transform (sort) them properly.

private void button1_Click(object sender, System.EventArgs e)
{
      string fn1 = "Planets.xml";
      string fn2 = "Sorted_Planets.xml";
      string fnx = "PlanetSort.xslt";

      FileStream fin = new FileStream(@fn1, FileMode.Open);
      XmlTextReader xr = new XmlTextReader(fin);
      System.Xml.XPath.XPathDocument xpd = new System.Xml.XPath.XPathDocument(xr);
      System.Xml.Xsl.XslTransform xslt = new System.Xml.Xsl.XslTransform();
      xslt.Load(@fnx);

      //  problems here...
      FileStream fout = new FileStream(@fn2, FileMode.Create);
      XmlTextWriter xw = new XmlTextWriter(fout, System.Text.Encoding.GetEncoding("UTF-8"));
      xw.WriteProcessingInstruction("xml", "version=\"1.0\" encoding=\"UTF-8\" ");
      xw.Formatting = Formatting.Indented;
      xw.WriteStartElement("Planets");
      xw.WriteStartElement("Planet");
      xw.WriteStartElement("Name");
      xw.WriteEndElement();
      xw.WriteEndElement();
      xw.WriteEndElement();
      xslt.Transform(xpd, null, xw);
      xr.Close();
      xw.Close();
}

------

Don't know if XSLT is useful but if you have different better methods, please let me know.
Advices, examples will be appreciated.  Thank you :)
rizelAsked:
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alkonautCommented:
You have to specify a valid xpath expression pointing to the element you wish to sort on. e.g. if you want to output the 3 planet nodes sorted by name you'd write

<xsl:template match="Planets">
  <xsl:apply-templates select="Planet">
    <xsl:sort select="Name"/>
  </xsl:apply-templates>
</xsl:template>

beacuse now you can see the path /PlanetData/Planet/Name

otherwise you could also use <xsl:sort select="Planet/Name"/> under Planets, but the nodes <PlanetData> have no element <Name> so they cannot be sorted on name.

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rizelAuthor Commented:
thanks :)
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