Libraries for working with Asynchronous Sockets?

Question

C++ / C#

Good afternoon/evening/night/morning.
Actually, everything you need is in the title.
ps - Don't offer NetSockets.
pss - The search for such libraries was unsuccessful.
psss - I would like functionality like in NetSockets.

Answer 1

Actually, everything you need is in the title.

No, not all. No specifics about library requirements.
TCP/IP is from the 80s of the last century and hasn't evolved much since then, so much is not included in the protocol itself and is still implemented by the developer of the application or library. And if in fact it is not implemented, then it does not work, this is me, just in case. It seems that everything is simple, what's tricky here - Read and Write, everything seems to have been done, it seems to have been checked, it seems to work, back and forth, but a couple of hours did not have time to pass - like bam - and the server "fell" into Exception along with your fee for work!
Will you have it at least via the Internet, or on a local network?
Those are two big differences.
Should the client or the server work 24/7, or did they start the server, start the client, send something back and forth and both finish after 15 minutes?
Well, so, I can advise you AwesomeSockets, they support both synchronous and asynchronous messages, but there is no sense from them, neither reliability nor ease of development, and it would take you no more than a week to write a similar library for everything -all.
From the serious - see SuperSocket and WCF, but once again, first formulate the problem.