Log4Net - Insert Header programatically

Load log4net's XML configuration and insert an XML element in the appender's layout with the header information. 

ie:

XmlDocument doc = new XmlDocument();

doc.LoadXml("<layout type=\"log4net.Layout.PatternLayout\">" +

"<conversionPattern value=\"sample\" />" +

"</layout>");

XmlElement root = doc.DocumentElement;

XmlNode layout = doc.SelectSingleNode("//layout");

XmlElement elem = doc.CreateElement("header");

elem.SetAttribute("value", "My Header");

elem.SetAttribute("type", "log4net.Util.PatternString");

layout.AppendChild(elem);

Result:

<layout type="log4net.Layout.PatternLayout">

   <conversionPattern value="sample" />

   <header value="My Header" type="log4net.Util.PatternString" />

</layout>