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Socket.GetSocketOption Method (SocketOptionLevel, SocketOptionName)

Returns the value of a specified Socket option, represented as an object.

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

Public Function GetSocketOption ( _
	optionLevel As SocketOptionLevel, _
	optionName As SocketOptionName _
) As Object
Dim instance As Socket
Dim optionLevel As SocketOptionLevel
Dim optionName As SocketOptionName
Dim returnValue As Object

returnValue = instance.GetSocketOption(optionLevel, optionName)
public Object GetSocketOption (
	SocketOptionLevel optionLevel, 
	SocketOptionName optionName
public function GetSocketOption (
	optionLevel : SocketOptionLevel, 
	optionName : SocketOptionName
) : Object
Not applicable.



One of the SocketOptionLevel values.


One of the SocketOptionName values.

Return Value

An object that represents the value of the option. When the optionName parameter is set to Linger the return value is an instance of the LingerOption class. When optionName is set to AddMembership or DropMembership, the return value is an instance of the MulticastOption class. When optionName is any other value, the return value is an integer.

Exception typeCondition


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


optionName was set to the unsupported value MaxConnections.


The Socket has been closed.

Socket options determine the behavior of the current Socket. Use this overload to get the Linger, AddMembership, and DropMembershipSocket options. For the Linger option, use Socket for the optionLevel parameter. For AddMembership and DropMembership, use IP. If you want to set the value of any of the options listed above, use the SetSocketOption method.


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 Mobile 2003 for Pocket PC, Windows Mobile 2003 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 retrieves the LingerOption and Send time-out values and displays them to the console.

    Console.WriteLine(("This application will timeout if Send does not return within " + Encoding.ASCII.GetString(s.GetSocketOption(SocketOptionLevel.Socket, SocketOptionName.SendTimeout, 4))))
    ' blocks until send returns
    Dim i As Integer = s.Send(msg)

    ' blocks until read returns
    Dim bytes(1024) As Byte

    'Display to the screen

    Console.WriteLine(("If data remains to be sent, this application will stay open for " + CType(s.GetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Linger), LingerOption).LingerTime.ToString()))
End Sub 'SetSocketOptions

    Console.WriteLine("This application will timeout if Send does not "
        + "return within " + Encoding.get_ASCII().GetString(s.
        SocketOptionName.SendTimeout, 4)));
    // blocks until send returns
    int i = s.Send(msg);
    // blocks until read returns
    ubyte bytes[] = new ubyte[1024];

    //Display to the screen
    Console.WriteLine("If data remains to be sent, this application "
        + "will stay open for " + ((LingerOption)(s.
} //SetSocketOptions

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, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0