How to modifyModify DocumentElement.Prefix in XmlDocument

[EDN Admin]

I have some sets of xml in which i have to add namespace prefix on nodes which doesnt have any prefix.
I have written a code which works for all node other then root element.
Please point me to the thing which i can do change the root element prefix as well.
<pre class="prettyprint private void ReplaceFile(string xmlfile)
{
XmlDocument doc = new XmlDocument();
doc.Load(xmlfile);
var a = doc.CreateAttribute("xmlns:mailxml12tm");
a.Value = "http://idealliance.org/Specs/mailxml12.0a/mailxml_tm";
doc.DocumentElement.Attributes.Append(a);
doc.DocumentElement.Prefix = "mailxml12tm";
//foreach (XmlNode item in doc.SelectNodes("//*").Cast<XmlNode>().Where(item => item.Prefix.Length == 0))
//{
// item.Prefix = "mailxml12tm";
//}
doc.Save(xmlfile);
}[/code]
<br/>
<hr class="sig Kamran Shahid Principle Engineer Development (MCP,MCAD,MCSD.NET,MCTS,MCPD.net[web])

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