Disconnect Method

Socket.Disconnect Method

Closes the socket connection and allows reuse of the socket.

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

public void Disconnect(
	bool reuseSocket


Type: System.Boolean
true if this socket can be reused after the current connection is closed; otherwise, false.


This method requires Windows 2000 or earlier, or the exception will be thrown.


The Socket object has been closed.


An error occurred when attempting to access the socket. See the Remarks section for more information.

If you are using a connection-oriented protocol, you can use this method to close the socket. This method ends the connection and sets the Connected property to false. However, if reuseSocket is true, you can reuse the socket.

To ensure that all data is sent and received before the socket is closed, you should call Shutdown before calling the Disconnect method.

If you need to call Disconnect without first calling Shutdown, you can set the DontLinger Socket option to false and specify a nonzero time-out interval to ensure that data queued for outgoing transmission is sent. Disconnect then blocks until the 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.


If you receive a SocketException, use the SocketException.ErrorCode property to obtain the specific error code. After you have obtained this code, refer to the Windows Sockets version 2 API error code documentation in the MSDN library for a detailed description of the error.


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

The following code example creates a socket for synchronous communication and sends some data to a remote host. It then calls Shutdown, to stop the send and receive activity, and Disconnect, to close the socket connection.

IPHostEntry ipHost = Dns.GetHostEntry(Dns.GetHostName());
IPAddress  ipAddr = ipHost.AddressList[0];
IPEndPoint ipEndPoint = new IPEndPoint(ipAddr, 11000);

Socket client = new Socket(AddressFamily.InterNetwork,
    SocketType.Stream, ProtocolType.Tcp);

// Connect the socket to the remote end point.

// Send some data to the remote device.
string data = "This is a string of data <EOF>";
byte[] buffer = Encoding.ASCII.GetBytes(data);

int bytesTransferred =  client.Send(buffer);

// Write to the console the number of bytes transferred.
Console.WriteLine("{0} bytes were sent.\n", bytesTransferred);

// Release the socket.

if (client.Connected) 
    Console.WriteLine("We're still connnected");
    Console.WriteLine("We're disconnected");

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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

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