Well, arguably microsoft.public.dotnet.framework would be a better
place to ask, as the question is unlikely to have anything that's
*specifically* about C#. Equally (for the same reason)
microsoft.public.dotnet.general would be fine. It may be worth
specifying that you're using C# so that people can reply with C# code
rather than with VB.NET code.
Alternatively, I'm sure no-one will bite your head off if you post your
question here
If it is related to System.Net.Sockets you can do it here or
in microsoft.public.dotnet.framework
:
Another NG for this is microsoft.public.win32.programmer.networks