The c# binding doesn't have support for the ZMQ_XPUB_VERBOSE socket option.
Or rather, I can't find support for it.  It may be there and I missed it.
I searched through the source and couldn't find a reference to it.
It looks like just a change to SocketOption.cs and ZmqSocet.cs
I'd be happy to take a stab at it if the devs are too busy.