New Post: tile

So I'm trying to replicate the following in Magick.NET and I can get most of it, but I don't seem to grasp how to make the -tile with a gradient part to happen. (oh I am using Magick.Net based off of imagemagick 6 because of my previous post of the difference with transparency masking) - thanks if you have a minute to point me in the right direction.

command line command:

convert -size 320x90 canvas:none -stroke snow4 -size 1x90 -tile gradient:white-snow4 -draw "roundrectangle 16, 5, 304, 85 20,40" test.png

My C# start:

    {
        String TempFile1 = "cylindertemp1.png";
         MagickReadSettings settings = new MagickReadSettings();
        settings.Width = 320;
        settings.Height = 90;

        // Create cynlinder
        using (MagickImage image = new MagickImage("xc:none", settings))
        {
            image.StrokeColor = new MagickColor("snow4");               
            image.FillColor = new MagickColor("white");
            Drawable[] draw_this = { new DrawableRoundRectangle(16, 5, 304, 85, 20, 40) };
            image.Draw(draw_this);

            image.Write(TempFile1);
        }
    }