socket编程设置socket.Receive()的等待时间：
IPEndPoint remohost=new IPEndPoint(IPAddress.Parse("192.168.0.125"),5010);
Socket s=new Socket(AddressFamily.InterNetwork,SocketType.Dgram,ProtocolType.Udp);
s.SetSocketOption(SocketOptionLevel.Socket,SocketOptionName.SendTimeout,time_out);
s.SetSocketOption(SocketOptionLevel.Socket,SocketOptionName.ReceiveTimeout,time_out);
……
明白？
设置socket.Receive()的等待时延
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