NetworkChange Class
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NetworkChange Class


Allows applications to receive notification when the Internet Protocol (IP) address of a network interface, also called a network card or adapter, changes.

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


public class NetworkChange


Obsolete.Initializes a new instance of the NetworkChange class.


Determines whether the specified object is equal to the current object.(Inherited from Object.)


Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)


Serves as the default hash function. (Inherited from Object.)


Gets the Type of the current instance.(Inherited from Object.)


Creates a shallow copy of the current Object.(Inherited from Object.)


Obsolete.Registers a network change instance to receive network change events.


Returns a string that represents the current object.(Inherited from Object.)


Occurs when the IP address of a network interface changes.


Occurs when the availability of the network changes.

The NetworkChange class provides address change notification by raising NetworkAddressChanged events. An interface address can change for many reasons, such as a disconnected network cable, moving out of range of a wireless Local Area Network, or hardware failure.

To receive notification, you must identify your application's event handlers, which are one or more methods that perform your application-specific tasks each time the event is raised. To have a NetworkChange object call your event-handling methods when a NetworkAddressChanged event occurs, you must associate the methods with a NetworkAddressChangedEventHandler delegate, and add this delegate to the event.

Legacy Code Example

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

using System;
using System.Net;
using System.Net.NetworkInformation;

namespace Examples.Net.AddressChanges
    public class NetworkingExample
        public static void Main()
            NetworkChange.NetworkAddressChanged += new 
            Console.WriteLine("Listening for address changes. Press any key to exit.");
        static void AddressChangedCallback(object sender, EventArgs e)

            NetworkInterface[] adapters = NetworkInterface.GetAllNetworkInterfaces();
            foreach(NetworkInterface n in adapters)
                Console.WriteLine("   {0} is {1}", n.Name, n.OperationalStatus);

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 2.0
Portable Class Library
Supported in: portable .NET platforms
Available since 3.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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