WinForms FAQ - XML

The XmlNode.AppendChild restricts you to add XmlNodes originated in the same XmlDocument. So, to do the above, here is a sample workaround:

[C#]
		// destParent and sourceParent are from different XmlDocuments.
		// This method will append the children of sourceParent to the destParent’s children.
		public static void TransferChildren(XmlDocument destDoc, XmlNode destParent, XmlNode sourceParent)
		{
			// Create a temporary element into which we will add the children.
			XmlElement tempElem = destDoc.CreateElement('Temp');
			tempElem.InnerXml = sourceParent.InnerXml;

			foreach(XmlNode node in tempElem.ChildNodes)
				destParent.AppendChild(node);
		}

[VB.Net]
		’ destParent and sourceParent are from different XmlDocuments.
		’ This method will append the children of sourceParent to the destParent’s children.
		Public Static  Sub TransferChildren(ByVal destDoc As XmlDocument, ByVal destParent As XmlNode, ByVal sourceParent As XmlNode)
			’ Create a temporary element into which we will add the children.
			Dim tempElem As XmlElement =  destDoc.CreateElement('Temp') 
			tempElem.InnerXml = sourceParent.InnerXml
 
			Dim node As XmlNode
			For Each node In tempElem.ChildNodes
				destParent.AppendChild(node)
			Next
		End Sub