Socket.DuplicateAndClose Method

Duplicates the socket reference for the target process, and closes the socket for this process.

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

public SocketInformation DuplicateAndClose (
	int targetProcessId
public SocketInformation DuplicateAndClose (
	int targetProcessId
public function DuplicateAndClose (
	targetProcessId : int
) : SocketInformation
Not applicable.



The ID of the target process where a duplicate of the socket reference is created.

Return Value

The socket reference to be passed to the target process.

Exception typeCondition


targetProcessID is not a valid process id.


Duplication of the socket reference failed.

The target process should use Socket to create the duplicate socket instance.

If you call the Socket constructor multiple times with the same byte array as the argument for each call, you will create multiple managed Sockets with the same underlying socket. This practice is strongly discouraged.

If the process creating the socket uses asynchronous methods (BeginReceive or BeginSend), the process must first set the UseOnlyOverlappedIO property to true; otherwise, the socket is bound to the completion port of the creating process, which may cause an ArgumentNullException to be thrown on the target process.

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

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

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