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The connection attribute of the Socket class often cannot accurately determine whether the network is Connected. The following code can solve this problem.
/// Whether the connection is established
Public virtual bool Connected
// Check whether the socket status is readable
If (m_socket.Connected & m_socket.Poll (0, SelectMode. SelectRead ))
Byte  aByte = new byte ;
// The TCP/IP protocol cannot accurately determine whether the network is available.
// Try to read a character. The specified read character in the Peek parameter will not be removed from the buffer.
// If it is readable, the connection is available.
If (m_socket.Receive (aByte, 0, 1, SocketFlags. Peek )! = 0)
Close ("Disconnected .");
Catch (SocketException e)
OnException (e );
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