LINQ Query of XMl

Question

<environments>

<environment>

<add key="Test1">

<add key="Test2">

<add key="Test3">

</environments>

</environment>

 

how to read all the list of key using LINQ tried it seems its not working

 

XDocument fooXML = XDocument.Load(configurationFileName);

var query = from a in fooXML.Element("environment").Elements("add")

select new

{

key = a.Attribute("key").Value,

val = a.Attribute("Value").Value

};