.NET events, what am I doing wrong?

[DoctorAutomatic]

I'm trying to register for a .NET event and I can't seem to get it to work. The Main.vi is posted in the snippet below but I've attached the Main and Callback vi's as a zip (2020 and 2016 versions). I don't really know much about .NET so I have a feeling I'm just not understanding something fundamental. I'm sure there are other ways to do what this example is attempting (detecting a network availability change) but the important point for me is to resolve the event problem and understand how to make this work, so please don't focus on alternatives.

 

[zou]

Have you tried to make your VIs run in UI thread?

[DoctorAutomatic]

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@zou wrote:

Have you tried to make your VIs run in UI thread?

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I haven't done anything "special" so I guess not. How do I do that? Also, can you explain some of the background of why that would be significant?

[zou]

VI Properties => Execution => Preferred Execution System => user interface

Some .Net functions require "Single Threaded Apartment" or STA.  i.e. UI thread.

You can google "LabVIEW .NET single-threaded apartment (STA)" for better explanation.