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Socket.SetSocketOption Method (SocketOptionLevel, SocketOptionName, Int32)

Sets the specified Socket option to the specified integer value.

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

public void SetSocketOption(
	SocketOptionLevel optionLevel,
	SocketOptionName optionName,
	int optionValue


Type: System.Net.Sockets.SocketOptionLevel

One of the SocketOptionLevel values.

Type: System.Net.Sockets.SocketOptionName

One of the SocketOptionName values.

Type: System.Int32

A value of the option.


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


The Socket has been closed.

Socket options determine the behavior of the current Socket. For an option with a Boolean data type, specify a nonzero value to enable the option, and a zero value to disable the option. For an option with an integer data type, specify the appropriate value. 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. If you intend to set any of these options, be sure to use the appropriate SocketOptionLevel 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.

SocketOptionLevel.IPv6 options that can be set using this overload.

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


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.

Windows 98, Windows NT 4.0 Platform Note: You must call the Bind method before using AddMembership as the optionName parameter.

Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows CE Platform Note: Not all socket options are supported on the .NET Compact Framework. For a list of options reserved for future use, see SocketOptionName.

The following code example sets the LingerOption and Send time-out values.

// Send operations will time-out if confirmation  
// is not received within 1000 milliseconds.
s.SetSocketOption (SocketOptionLevel.Socket, SocketOptionName.SendTimeout, 1000);

// The socket will linger for 10 seconds after Socket.Close is called.
LingerOption lingerOption = new LingerOption (true, 10);

s.SetSocketOption (SocketOptionLevel.Socket, SocketOptionName.Linger, lingerOption);
		// Specifies that send operations will time-out 
		// if confirmation is not received within 1000 milliseconds.
		s->SetSocketOption(SocketOptionLevel::Socket, SocketOptionName::SendTimeout, 1000);

		// Specifies that the Socket will linger for 10 seconds after Close is called.
		LingerOption *lingerOption = new LingerOption(true, 10);
		s->SetSocketOption(SocketOptionLevel::Socket, SocketOptionName::Linger, lingerOption);

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