How do I work with a CAD file (dwg - autocad)?

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C#

AutoCAD

I don't know much about CAD files or the Autocad prorietary file format of DWG.

I would like to understand how I can work with this format. Ideally, I want to be able to take a dwg file, search for a particular named object and then render a flat jpeg image and draw a circle around that object.

The files would be flat floor plans that have been marked up with desks. I would like to create n amount of images of the floor plan, where n is the amount of desk objects. Essentially making a bunch of unique "Desk is here!" images for each, where the floor plan is one image, but potentially hundreds of flat images will be made off of it.

I am very familiar with getting files, system.drawing.image, system.drawing.graphics and actually resizing the images, drawing on them and saving files out, but I have never had to work with AutoCAD files. Can anyone offer any help?

What I have tried:

using (var srcImage = Image.FromFile(file.FullName.ToString()))

<-- For the image drawing afterwards