C# xml Changing value of single Node

[EDN Admin]

Hi im trying to change value of single node in my xml file but im always getting Not Supported Exception.
here is a code :

<div style="color:Black;background-color:White; <pre>
XPathDocument oXPathDocument = <span style="color:Blue; new XPathDocument(<span style="color:#A31515; "dane.xml");
XPathNavigator oXPathNavigator = oXPathDocument.CreateNavigator();
XPathNodeIterator oPersonNodesIterator = oXPathNavigator.Select(<span style="color:#A31515; "/Role/Rola");
Console.WriteLine(<span style="color:#A31515; "W pliku XML, znaleziono dane następujących osób: ");
<span style="color:Blue; foreach (XPathNavigator oCurrentPerson <span style="color:Blue; in oPersonNodesIterator)
{

<span style="color:Blue; if (oCurrentPerson.SelectSingleNode(<span style="color:#A31515; "name").Value == x)
oCurrentPerson.SelectSingleNode(<span style="color:#A31515; "baza").SetValue(<span style="color:#A31515; "new text");

}
[/code]
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and here is xml structure :

<div style="color:Black;background-color:White; <pre>
<span style="color:Blue; <?<span style="color:#A31515; xml <span style="color:Red; version<span style="color:Blue; =<span style="color:Black; "<span style="color:Blue; 1.0<span style="color:Black; " <span style="color:Red; encoding<span style="color:Blue; =<span style="color:Black; "<span style="color:Blue; utf-8<span style="color:Black; "<span style="color:Blue; ?>
<span style="color:Blue; <<span style="color:#A31515; Role <span style="color:Red; xmlns:xsi<span style="color:Blue; =<span style="color:Black; "<span style="color:Blue; http://www.w3.org/2001/XMLSchema-instance<span style="color:Black; " <span style="color:Red; xmlns:xsd<span style="color:Blue; =<span style="color:Black; "<span style="color:Blue; http://www.w3.org/2001/XMLSchema<span style="color:Black; "<span style="color:Blue; >
<span style="color:Blue; <<span style="color:#A31515; Rola<span style="color:Blue; >
<span style="color:Blue; <<span style="color:#A31515; name<span style="color:Blue; >niezalogowany<span style="color:Blue; </<span style="color:#A31515; name<span style="color:Blue; >
<span style="color:Blue; <<span style="color:#A31515; user<span style="color:Blue; >niezalogowany<span style="color:Blue; </<span style="color:#A31515; user<span style="color:Blue; >
<span style="color:Blue; <<span style="color:#A31515; haslo<span style="color:Blue; >niezalogowany<span style="color:Blue; </<span style="color:#A31515; haslo<span style="color:Blue; >
<span style="color:Blue; <<span style="color:#A31515; serwer<span style="color:Blue; >SZPIC_LAPTOP<span style="color:Blue; </<span style="color:#A31515; serwer<span style="color:Blue; >
<span style="color:Blue; <<span style="color:#A31515; baza<span style="color:Blue; >Okulistyka<span style="color:Blue; </<span style="color:#A31515; baza<span style="color:Blue; >
<span style="color:Blue; </<span style="color:#A31515; Rola<span style="color:Blue; >
<span style="color:Blue; </<span style="color:#A31515; Role<span style="color:Blue; >
[/code]
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Thanks!


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