Visual studio and visual basic get properties

Hi good morning, I need help.  :robotindifferent:
In school I left an exercise in visual Basic and AutoCAD and need help,
The problem is that I need to do to get the properties to click a wall for example, what is the height, broad and then do things like operations.
The bad is that it's my first time doing this kind of development with AutoCAD, I would greatly appreciate if you help me step by step :robotsurprised:

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