UserDialogs Loading

async void Button_Clicked_3(System.Object sender, EventArgs args) {
    var cts = new CancellationTokenSource();
    try 
    {
        // if any exception is thrown, the progress will be cleaned up automagically
        using (var disp = UserDialogs.Instance.Loading(
            "Long Load...", 
            // this will cancel the actual http call
            () => cts.Cancel(), 
            "Cancel")) 
        {
            var data = await httpLong.GetData(cts.Cancel);
        }
    }
    catch (Exception ex) {
        UserDialogs.Instance.Alert(ex.ToString());
    }
}