Windows Phone get value from url with xml code

I am trying to get live currency rate from this url: http://ift.tt/1pXXFk7

This is what I tried:

public void getRate(string howmuch, string from, string to)
    {
        int hmuch = int.Parse(howmuch);
        string url = "http://ift.tt/1pXXFk7";
        var xml = XDocument.Load(url);
        var result = xml.Descendants("double");
        btn.Content = result;
    }

I get an error from XDocument.Load that I need to pass URI from filesystem, not URL from web. I didn't found correct way on the web to do this in windows phone, only with full C#. How to properly get that value between double tags?