Question

Consider the Socket.BeginSend() method. If two thread pool threads were to call this method simultaneously, would their respective messages end up mixing with each other or does the socket class keep this from happening?

Answer 1

I found a smiliar post on the MSDN forum which seems to answer to your question.

1. You can queue multiple BeginSends at the same time. You don’t need to lock

Edit:

Even more interesting informations:

If you scroll down a bit in the Remark section of the MSDN doc BeginSend(), you will find interesting use of callback methods that could be relevant for you.

[…] If you want the original thread to block after you call the BeginSend method, use the WaitHandle.WaitOne method. […]