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Socket.Accept Method

Creates a new Socket for a newly created connection.

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

public Socket Accept()

Return Value

Type: System.Net.Sockets.Socket
A Socket for a newly created connection.


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


The Socket has been closed.


The accepting socket is not listening for connections. You must call Bind and Listen before calling Accept.

Accept synchronously extracts the first pending connection request from the connection request queue of the listening socket, and then creates and returns a new Socket. You cannot use this returned Socket to accept any additional connections from the connection queue. However, you can call the RemoteEndPoint method of the returned Socket to identify the remote host's network address and port number.

In blocking mode, Accept blocks until an incoming connection attempt is queued. Once a connection is accepted, the original Socket continues queuing incoming connection requests until you close it.

If you call this method using a non-blocking Socket, and no connection requests are queued, Accept throws a SocketException. 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.


Before calling the Accept method, you must first call the Listen method to listen for and queue incoming connection requests.


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

The following code example accepts a simple Socket connection.

protected void AcceptMethod(Socket listeningSocket)
 Socket mySocket = listeningSocket.Accept();

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.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.