New answers tagged transparency
I'm going to post an answer here that explains or elaborates a bit more than my answer at the possible duplicate question How to vary the transparency of symbols within a single layer in ArcMap? (and the related one linked to it) because your question is a little more general whereas that one is looking to accomplish a specific thing. The first thing to be ...
Use esriSimpleFillStyle.esriSFSHollow. Or even esriSimpleLineStyle.esriSLSNull can be used.
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