XElement.Nodes() and similar methods doesn't work - linq

Question

I am new to Windows phone development and currently I am facing an issue. I am working on consuming a RESTful service for a windows phone application and I am getting a response successfuly in the format shown below
<StationsResp xmlns="http://www.wmata.com" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<Stations>
<Station>
<Code>A03</Code>
<Lat>38.9095980575</Lat>
<LineCode1>RD</LineCode1>
<LineCode2 i:nil="true" />
<LineCode3 i:nil="true" />
<LineCode4 i:nil="true" />
<Lon>-77.0434143597</Lon>
<Name>Dupont Circle</Name>
<StationTogether1 />
<StationTogether2 />
</Station>
<Station>
<Code>A02</Code>
<Lat>38.9032019462</Lat>
<LineCode1>RD</LineCode1>
<LineCode2 i:nil="true" />
<LineCode3 i:nil="true" />
<LineCode4 i:nil="true" />
<Lon>-77.0397008272</Lon>
<Name>Farragut North</Name>
<StationTogether1 />
<StationTogether2 />
</Station>
</Stations>
</StationsResp>
My C# code goes below to call the service and store this response.
private void MainPage_Loaded(object sender, RoutedEventArgs e)
{
Uri uri = new Uri("http://api.wmata.com/Rail.svc/Stations?api_key=API_KEY_CODE_OMITTED_INTENTIONALLY");
WebClient webClient = new WebClient();
webClient.DownloadStringCompleted += OnDownloadStringCompleted;
webClient.DownloadStringAsync(uri);
}
void OnDownloadStringCompleted(object sender, DownloadStringCompletedEventArgs args)
{
XElement elm = XElement.Load(args.Result);
var SearchResults = elm.Elements("Station");
}
My Problem is with the last line. object 'elm' has the value as per the response posted above. However, when I try to query the object elm using any methods [like elm.Descendents(), elm.Elements()] it doesn't work. My System.Xml.Linq reference version for windows phone is 2.0.5.0. Am I missing something else?
Following is the exact error message I get.
On watch window I see the value in object elm. But LINQ query elm.Elements("Station") errors out. The error message is "System.Collections.IEnumerator.CurrentCould not evaluate expression".
Any help is greatly appreciated. Thanks in advance.