New Post: How to convert a single PNG to multi-resolution (multi size) ICO?

I successfully converted PNG image to ICO using this code:

using (var magic = new MagickImage(convertImagePath))
{
     magic.Write(convertedFileName);
}

But I found that the ICO file has only 1 resolution which is the same with the original PNG. Can I convert PNGs to have a multiple-sized ICO file?