xml add prefix

<s:Envelope xmlns:a="http://www.w3.org/" xmlns:s="http://www.w3.org/2003/pe">
  <Header />

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I need it to be

<s:Envelope xmlns:a="http://www.w3.org/" xmlns:s="http://www.w3.org/2003/pe">
<a:Action s:mustUnderstan="2">some verbage jere</a:Action>

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c# code below
 const string prefix = "s";
            XmlDocument doc = new XmlDocument();
            const string nameSpaceUri = @"http://www.w3.org/2005/08/addressing";
            XmlElement root = doc.CreateElement(prefix, "Envelope", nameSpaceUri);
            root.SetAttribute("xmlns:a", "http://www.w3.org");
            root.SetAttribute("xmlns:s", "http://www.w3.org/2003/pe");

            XmlElement Head = doc.CreateElement("Header");

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Seven priceFull StackAsked:
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Try using the prefix and namespace in the CreateElement call:
XmlElement Head = doc.CreateElement(prefix, "Header", "http://www.w3.org/2003/pe");

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Seven priceFull StackAuthor Commented:
that is not helping me. the
 <s:Header xmlns:s="http://www.w3.org/2003/pe" />

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it should be

 <s:Header />

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When I tried it, the xmlns:s part is not included, since it's already on a parent node.
I'll try again later when I have time.
Seven priceFull StackAuthor Commented:
I figured it out. you have to use namespaces.
thanks anyway.

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Seven priceFull StackAuthor Commented:
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