Can somebody help me?
when I set
secureSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, 10);
secureSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.SendTimeout, 10);

the operathins do not timeout. they continue to wait for data receive/send

The preferred method is to use the asynchronous methods. Select is not supported, SetSocketOption is an 'at your own risk' function [some options may work, others may not].

Thank you very mutch