Async Sockets in C#?

I am trying to use AsyncReceivedString() and functions related to Async. You mentioned the new model for asynchronous programming introduced in Chilkat v9.5.0.52 Is it already put on web site for download?? Especially, I need for VS2013 version. If so, may I get example code by c# for asynchronous programming?? Basically, I can't see example about asynchronous programming in Socket by C#!