MSDN:
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XslCompiledTransform xslt = new XslCompiledTransform();
xslt.Load("output.xsl");// Execute the transform and output the results to a file.
xslt.Transform("books.xml", "books.html");
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ms-help://MS.VSCC.v90/MS.MSDNQTR.v90.chs/fxref_system.xml/html/c1d16364-4472-3dac-33fb-45e3870434c7.htm
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XslCompiledTransform xslt = new XslCompiledTransform();
xslt.Load("output.xsl");// Execute the transform and output the results to a file.
xslt.Transform("books.xml", "books.html");
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ms-help://MS.VSCC.v90/MS.MSDNQTR.v90.chs/fxref_system.xml/html/c1d16364-4472-3dac-33fb-45e3870434c7.htm
<?xml-stylesheet href="test.xslt" type="text/xsl"?>