System.Net.NetworkInformation.SystemNetworkInterface.InternalGetIsNetworkAvailable C# (CSharp) Method

        internal static bool InternalGetIsNetworkAvailable()
        {
            try
            {
                NetworkInterface[] networkInterfaces = GetNetworkInterfaces();
                foreach (NetworkInterface netInterface in networkInterfaces)
                {
                    if (netInterface.OperationalStatus == OperationalStatus.Up && netInterface.NetworkInterfaceType != NetworkInterfaceType.Tunnel
                        && netInterface.NetworkInterfaceType != NetworkInterfaceType.Loopback)
                    {
                        return true;
                    }
                }
            }
            catch (NetworkInformationException nie)
            {
                if (NetEventSource.IsEnabled) NetEventSource.Error(null, nie);
            }

            return false;
        }

            private static void ChangedAddress(object sender, EventArgs eventArgs)
            {
                lock (syncObject){
                    bool isAvailableNow = SystemNetworkInterface.InternalGetIsNetworkAvailable();

                    if (isAvailableNow != isAvailable)
                    {
                        isAvailable = isAvailableNow;

                        DictionaryEntry[] callerArray = new DictionaryEntry[s_availabilityCallerArray.Count];
                        s_availabilityCallerArray.CopyTo(callerArray, 0);

                        for (int i = 0; i < callerArray.Length; i++)
                        {
                            NetworkAvailabilityChangedEventHandler handler = (NetworkAvailabilityChangedEventHandler)callerArray[i].Key;
                            ExecutionContext context = (ExecutionContext)callerArray[i].Value;
                            if (context == null)
                            {
                                handler(null, new NetworkAvailabilityEventArgs(isAvailable));
                            }
                            else
                            {
                                ExecutionContext.Run(context.CreateCopy(), s_RunHandlerCallback, handler);
                            }
                        }
                    }
                }
            }