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TcpListener::Stop Method

Closes the listener.

Namespace:  System.Net.Sockets
Assembly:  System (in System.dll)

void Stop()


Use the SocketException::ErrorCode property to obtain the specific error code. When you have obtained this code, you can refer to the Windows Sockets version 2 API error code documentation in MSDN for a detailed description of the error.

Stop closes the listener. Any unaccepted connection requests in the queue will be lost. Remote hosts waiting for a connection to be accepted will throw a SocketException. You are responsible for closing your accepted connections separately.


This member outputs trace information when you enable network tracing in your application. For more information, see Network Tracing in the .NET Framework.

Notes to Callers

The Stop method also closes the underlying Socket, and creates a new Socket for the TcpListener. If you set any properties on the underlying Socket prior to calling the Stop method, those properties will not carry over to the new Socket.

The following code example demonstrates using the Stop method to close the underlying Socket.

#using <System.dll>

using namespace System;
using namespace System::IO;
using namespace System::Net;
using namespace System::Net::Sockets;
using namespace System::Text;
using namespace System::Threading;
void main()

      // Set the TcpListener on port 13000.
      Int32 port = 13000;
      IPAddress^ localAddr = IPAddress::Parse( "" );

      // TcpListener* server = new TcpListener(port);
      TcpListener^ server = gcnew TcpListener( localAddr,port );

      // Start listening for client requests.

      // Buffer for reading data 
      array<Byte>^bytes = gcnew array<Byte>(256);
      String^ data = nullptr;

      // Enter the listening loop. 
      while ( true )
         Console::Write( "Waiting for a connection... " );

         // Perform a blocking call to accept requests. 
         // You could also user server.AcceptSocket() here.
         TcpClient^ client = server->AcceptTcpClient();
         Console::WriteLine( "Connected!" );
         data = nullptr;

         // Get a stream Object* for reading and writing
         NetworkStream^ stream = client->GetStream();
         Int32 i;

         // Loop to receive all the data sent by the client. 
         while ( i = stream->Read( bytes, 0, bytes->Length ) )

            // Translate data bytes to a ASCII String*.
            data = Text::Encoding::ASCII->GetString( bytes, 0, i );
            Console::WriteLine( "Received: {0}", data );

            // Process the data sent by the client.
            data = data->ToUpper();
            array<Byte>^msg = Text::Encoding::ASCII->GetBytes( data );

            // Send back a response.
            stream->Write( msg, 0, msg->Length );
            Console::WriteLine( "Sent: {0}", data );

         // Shutdown and end connection
   catch ( SocketException^ e ) 
      Console::WriteLine( "SocketException: {0}", e );

   Console::WriteLine( "\nHit enter to continue..." );

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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