Saving a control to png in WPF (c#)

I was going to use System.Drawing like I did before.. turns out wpf already has this built in..

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// uiPage.ren
public void DoPageToPng(string fileName)
{
    RenderTargetBitmap rtb = new RenderTargetBitmap((int)uiPage.ActualWidth, (int)uiPage.ActualHeight, 96, 96, PixelFormats.Pbgra32);
    rtb.Render(uiPage);

    PngBitmapEncoder png2 = new PngBitmapEncoder();
    png2.Frames.Add(BitmapFrame.Create(rtb));
    using (MemoryStream stream = new MemoryStream())
    {
        png2.Save(stream);
        using (System.Drawing.Image image = System.Drawing.Image.FromStream(stream))
        {
            image.Save(fileName);
        }
    }
}