how to load string with special characters in to XElement?

I am trying to load an XML which 开发者_开发技巧has special characters such as ö and ® into XElement. But I get an error saying "Invalid character in the given encoding". Where do I set the encoding so that I will be able to load the string?

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You could set the encoding in the first line of the XML file:

<?xml version="1.0" encoding="utf-8"?>

Could you show your XML file?