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copied!<p>As per my recommendation please use new Async form of <code>XXXReceive</code> and 'XXXSend' (where XXX stands for <code>Begin</code> and <code>End</code>), the new methods available are <a href="http://msdn.microsoft.com/en-us/library/system.net.sockets.socket.receiveasync.aspx" rel="nofollow">ReceiveAsync</a> and <a href="http://msdn.microsoft.com/en-us/library/system.net.sockets.socket.sendasync.aspx" rel="nofollow">SendAsync</a> methods which uses <a href="http://msdn.microsoft.com/en-us/library/system.net.sockets.socketasynceventargs.aspx" rel="nofollow">SocketAsyncEventArgs</a> to pass the socket and other information on the callbacks event handlers.</p> <p>I had seen a good working example of socket client and server on msdn archive which was scalable upto 500 connections (As I had tested in one of project adaptation from it) but currently I am not able to find that link from googling.. but here is another link from msdn archive on the same topic hopefully it will help you - <a href="http://msdn.microsoft.com/en-us/magazine/cc300760.aspx" rel="nofollow">Get Closer to the Wire with High-Performance Sockets in .NET</a>..</p> <h2>UPDATE</h2> <p>First of all <strong>I</strong> can only provide you idea to final implementation and if possible some short example code snippets. ok here I go with more details </p> <p><strong>I think you can jump to last paragraph's link. ;)</strong></p> <p>Let me highlight once because I want to, I said <code>SendAsync</code> and <code>ReceiveAsync</code> not <code>BeginReceive/EndReceive</code> and <code>BeginSend/EndSend</code> i.e. Event-based Async Pattern (EAP) </p> <blockquote> <p>Benefit of using Async form of Socket methods is that they are exception-less approach to socket programming which can prove faster than BeginSend/EndSend methods.</p> </blockquote> <p>Here is the link for the sample which I have found to be useful upto 500 PARALLEL connections - <a href="http://archive.msdn.microsoft.com/nclsamples/Wiki/View.aspx?title=Socket%20Performance" rel="nofollow">Networking Samples for .NET v4.0</a></p> <p>For you need to use await/async feature of .NET 4.5. Here is the .NET 4.5 code snippet showing usage of <code>WebSocket</code> class which of can be adapted to <code>Socket</code> implementations also - <a href="http://www.asp.net/vnext/overview/aspnet/whats-new#_Toc318097383" rel="nofollow">Support for WebSockets Protocol</a> (I guess WebSocket's <code>AspNetWebSocketContext</code> will be Socket's <code>SocketAsyncEventArgs</code>)</p> <p><em>I found <a href="http://blogs.msdn.com/b/pfxteam/archive/2011/12/15/10248293.aspx" rel="nofollow">Awaiting Socket Operations</a> sample code from <a href="http://blogs.msdn.com/b/pfxteam" rel="nofollow">MSDN - Parallel Programming team blog</a> which can be useful to use to implement await/async from .NET 4.5 framework.</em></p> <p>I hope this proves helpful to you.</p>

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