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copied!<p>In regard to the buffer problem try the following:</p> <p>Create a class called StateObject to store any data you want to have in your callback, with a buffer, also including the socket if you so need it (as I see that you are currently passing udpSock as your stateObject). Pass the newly created object to the async method and then you will have access to it in your callback.</p> <pre><code>public void Starter(){ StateObject state = new StateObject(); //set any values in state you need here. //create a new socket and start listening on the loopback address. Socket lSock = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); lSock.Bind(new IPEndPoint(IPAddress.Parse("127.0.0.1"), 12345); EndPoint ncEP = new IPEndPoint(IPAddress.Any, 0); lSock.BeginReceiveFrom(state.buffer, 0, state.buffer.Length, SocketFlags.None, ref ncEP, DoReceiveFrom, state); //create a new socket and start listening on each IPAddress in the Dns host. foreach(IPAddress addr in Dns.GetHostEntry(Dns.GetHostName()).AddressList){ if(addr.AddressFamily != AddressFamily.InterNetwork) continue; //Skip all but IPv4 addresses. Socket s = new Socket(addr.AddressFamily, SocketType.Dgram, ProtocolType.Udp); s.Bind(new IPEndPoint(addr, 12345)); EndPoint newClientEP = new IPEndPoint(IPAddress.Any, 0); StateObject objState = new StateObject(); s.BeginReceiveFrom(objState.buffer, 0, objState.buffer.length, SocketFlags.None, ref newClientEP, DoReceiveFrom, objState); } } </code></pre> <p>In searching this question I found:</p> <p><a href="http://msdn.microsoft.com/en-us/library/system.net.sockets.socket.beginreceivefrom.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/system.net.sockets.socket.beginreceivefrom.aspx</a></p> <p>You can then cast the StateObject from AsyncState as you are currently doing with udpSock and your buffer, as well as anyother data you need would be stored there.</p> <p>I suppose that now the only problem is how and where to store the data, but as I don't know your implementation I can't help there.</p>

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