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>So, could it be that I need to specify (for now) the whole path to that dll? The dll is included into the project (not as a reference) and I checked Always copy as you suggested in another message.
The error:
A first chance exception of type 'System.DllNotFoundException' occurred in Siriusware.Middleware.dll
Seems to suggest that yes, it's not finding your DLL (well, it's not finding SOME DLL, not sure which). Yes, embed the full path (prefix with @"C:\PathToDll\").