You can use this sample code from MSDN.
var client = new HttpClient();
var uri = new Uri("http://ponify.me/stats.php");
Stream respStream = await client.GetStreamAsync(uri);
DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(rootObject));
rootObject feed = (rootObject)ser.ReadObject(respStream);
System.Diagnostics.Debug.WriteLine(feed.SONGHISTORY[0].TITLE);
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