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NetworkChange.NetworkAddressChanged Event

Occurs when the IP address of a network interface changes.

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

Public Shared Event NetworkAddressChanged As NetworkAddressChangedEventHandler

The NetworkChange class raises NetworkAddressChanged events when the address of a network interface, also called a network card or adapter, changes.

To have a NetworkChange object call an event-handling method when a NetworkAddressChanged event occurs, you must associate the method with a NetworkAddressChangedEventHandler delegate, and add this delegate to this event.

The NetworkAddressChanged event is supported on Windows 2000 and later.

The following code example listens for address changes and displays the status of network interfaces when a NetworkAddressChanged event occurs.

Imports System
Imports System.Net
Imports System.Net.NetworkInformation

Public Class NetworkingExample
    Public Shared Sub Main()
        AddHandler NetworkChange.NetworkAddressChanged, AddressOf AddressChangedCallback
        Console.WriteLine("Listening for address changes. Press any key to exit.")
    End Sub 'Main
    Private Shared Sub AddressChangedCallback(ByVal sender As Object, ByVal e As EventArgs)

        Dim adapters As NetworkInterface() = NetworkInterface.GetAllNetworkInterfaces()
        Dim n As NetworkInterface
        For Each n In adapters
            Console.WriteLine("   {0} is {1}", n.Name, n.OperationalStatus)
        Next n
    End Sub
End Class

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

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.