how to insert and update XML in silverlight not in isolated storage.?

[EDN Admin]

I am having .XML file including silverlight project look like this

<ServiceReply>
<StockQuote symbol=IBM price=32.50 quotetime=01/01/2010 12:21:00/>
<StockQuote symbol=MSFT price=21.20 quotetime=01/01/2010 12:20:30 />
</ServiceReply>


I need to update the XML value like price.? Pls help me.

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