C# - Determine If You Are Online

by Bill Rawlinson —

You can use the following code to determine if you are online or not:

using System.Net.NetworkInformation;


...



public static bool IsOnline()
{
  bool isConnected = false;
  NetworkInterface[] adapters = NetworkInterface.GetAllNetworkInterfaces();
  foreach (NetworkInterface n in adapters)
  {
    if (n.OperationalStatus == OperationalStatus.Up && n.NetworkInterfaceType != NetworkInterfaceType.Loopback)
    {
    // Since we have a non loopback interface up, we have a network connection
    isConnected = true;
    break;
    }
  }
  return isConnected;
}

Update: I added a “break” to the loop so that I exit as soon as I find a good connection.

Comments

Bill

Thanks Paul.

Here are the documentation for GetIsNetworkAvailable

Paul Lo

There is a more simple way:

bool isNetworkAvailable = System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable();

starsky

ignore me, I read it wrong :D

starsky

That function will only tell you if the last adapter in your collection is online.