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I'm implementing in C# a discovery protocol (DNS-SD). I've a small problem: when my program is running, I need to detect when a new connection is established (network cable plugged or wifi joined), to announce myself on those network too.
But how to detect this? I've seen some code to get the current state of a network card, but no event, and I want to avoid to make some polling on the network cards states.
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Windows does not turn off the Wi-Fi connection automatically when you connect an Ethernet cable. You have to do it manually -- unless you use this nifty method that's easy enough to do even if you aren't tech-savvy.
Go to Network and Internet settings in Windows, then Change Adapter settings. Select the wired connection, then edit its properties. Select Internet Protocol Version 4 (TCP/IPv4) and edit the properties. Select Use the following IP address and type in a static address.
Ethernet cables plug into Ethernet ports, which are larger than phone cable ports. An Ethernet port on a computer is accessible through the Ethernet card on the motherboard. This port is usually on the back of a desktop computer, or on the side of a laptop.
Try to connect to the same network on a different device. If you can connect, the source of the problem is likely due to your first PC. If you can't connect to the Ethernet network on either PC, it might be a problem with your router, internet service provider, or USB to Ethernet adapter.
You can use the GetIstNetworkAvailable-method to check if there is a network connection at all. Whenever it changes the NetworkAvailabilityChanged event get's fired. For more information see this question.
If you want to track the availability of different NetworkInterfaces here is an sample on how to do this.
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