Get Items on Sorted List

Hello All, 

      I have a list of Books in an XML, Where I want to list it in any of the WPF control as a Hierarchy.

preconditions: List should be Sorted and Grouped  on Authors, the Sublist must be numbered list.  

<?xml version="1.0" encoding="utf-8"?><Library><Book><Title>C# Basics</Title><Author>Dev</Author><Author>Sulfi</Author></Book><Book><Title>Java Core</Title><Author>Bjourne</Author></Book><Book><Title>Android Hands on</Title><Author>Dev</Author></Book><Book><Title>IOS First</Title><Author>Dev</Author><Author>Sulfi</Author></Book><Book><Title>Server 2008</Title><Author>SQ.Hell</Author></Book><Book><Title>C Path</Title><Author>Sulfi</Author></Book></Library>

Regards

Salam

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