New Post: MagickImage property ResolutionUnits changed?

I have installed new version of magick.Net library it's giving error that resolutionUnits property doesn't exists and aslo i am changing image dpi to 150 using the following code
MagickImage tmp = new MagickImage("sample");
tmp.Density = new PointD(150, 150);
even this doesn't work now. Anything changed in new version?

Thanks