Socket.Close Method

Closes the Socket connection and releases all associated resources.

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

public void Close()

The Close method closes the remote host connection and releases all managed and unmanaged resources associated with the Socket. Upon closing, the Connected property is set to false.

For connection-oriented protocols, it is recommended that you call Shutdown before calling the Close method. This ensures that all data is sent and received on the connected socket before it is closed.

If you need to call Close without first calling Shutdown, you can ensure that data queued for outgoing transmission will be sent by setting the DontLinger Socket option to false and specifying a non-zero time-out interval. Close will then block until this data is sent or until the specified time-out expires. If you set DontLinger to false and specify a zero time-out interval, Close releases the connection and automatically discards outgoing queued data.

NoteNote:

To set the DontLinger socket option to false, create a LingerOption, set the enabled property to true, and set the LingerTime property to the desired time out period. Use this LingerOption along with the DontLinger socket option to call the SetSocketOption method.

NoteNote:

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

The following code example closes a Socket.

aSocket.Shutdown(SocketShutdown.Both);
aSocket.Close();
aSocket->Shutdown(SocketShutdown::Both);
aSocket->Close();
if (aSocket->Connected) {
   Console::WriteLine(S"Winsock error: {0}", Convert::ToString(System::Runtime::InteropServices::Marshal::GetLastWin32Error()) );
}

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0
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