I'm trying to do something as simple as calling a REST API using an universal app for windows 10 IoT but I can't find a way to do it.
Normally I would use:
private XElement ImportData(string sourceUrl)
    {
        WebClient wc = new WebClient();
        String source = wc.DownloadString(sourceUrl);
        return XElement.Parse(source, LoadOptions.None);
    }
but it isn't available.