I never used the toolkit; but at least till Oct-2014, author of the toolkit was saying following:
Evil DICOM does not have any image classes to help with this. While that might seem strange to not include image tools in a DICOM library, it is not the original intent of the the library. Evil DICOM is more for manipulating and analysis of DICOM data. I used to have some image parts in the old library which I believe is still available on SourceForge. You can take a look, but the PixelData tag has the raw bits to put together an image. .NET has several classes that can help with that, but I don't have anything to write here in this post. If I get some time, I will write a blog post about how to do it on the website (rexcardan.com).
Source: GitHub
Apparently, it was not original intent of the toolkit to include imaging support in toolkit. Not sure if this is changed since then. Author was planning to write an article to achieve this through DotNet; not sure if he wrote any then after. Old library from SourceForge may create other issues as it might not have been updated since long.
You can find some example code here.