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Socket.SetSocketOption Method (SocketOptionLevel, SocketOptionName, Boolean)

Note: This method is new in the .NET Framework version 2.0.

Sets the specified Socket option to the specified Boolean value.

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

void SetSocketOption (
	SocketOptionLevel optionLevel, 
	SocketOptionName optionName, 
	bool optionValue
public void SetSocketOption (
	SocketOptionLevel optionLevel, 
	SocketOptionName optionName, 
	boolean optionValue
public function SetSocketOption (
	optionLevel : SocketOptionLevel, 
	optionName : SocketOptionName, 
	optionValue : boolean



One of the SocketOptionLevel values.


One of the SocketOptionName values.


The value of the option, represented as a Boolean.

Exception typeCondition


The Socket object has been closed.


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

Socket options determine the behavior of the current Socket. Set optionValue to true to enable the option, or to false to disable the option.

Socket options are grouped by level of protocol support.

Listed below are the various Socket options that can be set using this overload. These options are grouped by the appropriate SocketOptionLevel value. If you intend to set any of these options, be sure to use the appropriate SocketOptionLevel value for the optionLevel parameter. The option you choose to set must be specified in the optionName parameter. If you want to get the current value of any of the options listed, use the GetSocketOption method.

SocketOptionLevel.Socket options that can be set using this overload.

SocketOptionLevel.IP options that can be set using this overload.

SocketOptionLevel.Tcp options that can be set using this overload.

SocketOptionLevel.Udp options that can be set using this overload.

For more information on these options, refer to the SocketOptionName enumeration.


If you receive a SocketException exception, 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.

The following code example opens a socket and enables the DontLinger and the OutOfBandInline socket options.

// Establish the local endpoint for the socket.
IPHostEntry ipHost = Dns.Resolve(Dns.GetHostName());
IPAddress  ipAddr = ipHost.AddressList[0];
IPEndPoint ipEndPoint = new IPEndPoint(ipAddr, 11000);

// Create a TCP socket.
Socket client = new Socket(AddressFamily.InterNetwork,
    SocketType.Stream, ProtocolType.Tcp);

// Connect the socket to the remote endpoint.

// Set option that allows socket to close gracefully without lingering.
client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.DontLinger, true);

// Set option that allows socket to receive out-of-band information in the data stream.
client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.OutOfBandInline, true);

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0