How to find the duplicate nodes in XML using C#

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I have unstructured XML as shown below

<Root name="FIRST" serviceidentifier="">
  <SERVER response="SERVICE NOT FOUND" type="SERVER" identifier="NONE" misc="NOT FOUND"/>
</Root>
<Root name="SECOND" serviceidentifier="">
  <SERVER response="SERVICE NOT FOUND" type="SERVER" identifier="NONE" misc="NOT FOUND"/>
</Root>	
<Root name="FIRST" serviceidentifier="">
  <SERVER response="SERVICE NOT FOUND" type="SERVER" identifier="NONE" misc="NOT FOUND"/>
</Root>

I Have to find the line number of the XML which has duplicate nodes with the attribute "FIRST" like "Root name=FIRST"

What I have tried:

I am New to XML So please give me a Complet CODE

Thanks for your help .....

Posted 11-Jun-17 20:09pm

manoj1412012

Updated 11-Jun-17 20:21pm

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Thanks7872 12-Jun-17 5:12am

'What I have tried' is meant to provide clarification on What have you tried. 'I am New to XML So please give me a Complet CODE' is not a valid text for that section. At least try something and come back with the problems you are facing. Nobody here will be happy to 'give you Complete Code'.

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Kornfeld Eliyahu Peter · Answer 1 · 2017-06-11T20:21:00

Your first and most severe problem is that this is not an XML (not valid), so you can not load it into an XmlDocument[^] object...
So first wrap it into a virtual root make it valid XML, than use XMLDocument and XPath to find elements with the same attributes...
XPath Examples[^]
[^]
Select Nodes Using XPath Navigation | Microsoft Docs[^]