XSLT To XML Conversion Issue for Function

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C#

C#4.0

Hi All, I am trying to convert XML File using XSLT for function but i am getting error as "upper-case() is an unknown XSLT function." Below is My C# code and input files.

1. C# Code
XslCompiledTransform trs = new XslCompiledTransform();
trs.Load(stylesheet);
trs.Transform(filename, output);

2. XSL File input
xsl:value-of select="upper-case(title)"

3. XML File

<?xml version="1.0" encoding="ISO-8859-1"?>
<?xml-stylesheet type="text/xsl" href="myStyleSheet.xsl"?>
<catalog>
  <cd>
    <title>Empire Burlesque</title>
    <artist>Bob Dylan</artist>
    <country>USA</country>
    <company>Columbia</company>
    <price>10.90</price>
    <year>1985</year>
  </cd>
</catalog>

Thanks
Raviranjan