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If when the data is accessed it is sorted by ID_Hierarchy then it does not matter what order the data is in when it is stored. If however you need to store the data in a specified order anywhay, then the XmlNode.InsertAfter Method should work.
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Thanks but XMLNode.InsertAfter is not Linq.
However, with your idea, I found about the same method with LinQ : XNode.AddAfterSelf().