.NET 2 Write to XML File

I've looked at tons of examples online but haven't been able to find any that have made me understand how to do what I'm trying to accomplish.  I have an XML config file for some misc. settings on a website.  From the admin interface I want these to be configurable, so the site has to write back to the XML file.  The XML file is structured as
<params>
  <registration>
    <setting1>value</setting1>
    <setting2>value2</setting2>
  </registration>
  etc...
</params>

How can I do here the equivalent of the SQL update set setting1=newvalue?

Thanks!
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anoyesAsked:
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RejojohnyCommented:
you can create a empty dataset or read the existing config file into a dataset and then save the dataset into xml ...

Rejo
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