gistfile1.txt

void scrim_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
    XElement xmlScrim = XElement.Parse(e.Result, LoadOptions.None);

    RunOnUiThread(() => {
            var scrimresult = FindViewById<EditText>(Resource.Id.result);
            scrimresult.Text = xmlScrim.Element("url").Value;
    });
}