private void Render()
        {
            for(int y = 0; y < data.Count; y++)
            {
                PutLine(data[y]);

                var d = source.Dispatcher.BeginInvoke(new Action(() => source.Source = BitmapToImageSource(bmp)));
                while (d.Status != System.Windows.Threading.DispatcherOperationStatus.Completed)
                {
                    Thread.Sleep(1);
                }
            }
        }