public static void PingServer(object o)
{
var serverAddressAndPort = (string[])o;
var serverAddress = serverAddressAndPort[0];
var serverPort = Convert.ToInt32(serverAddressAndPort[1]);
Server server = new Server(serverAddress, serverPort);
var isActive = server.Ping();
var result = activeServers.Find(item => item.port == server.port);
if (isActive && result == null)
{
activeServers.Add(server);
}
else if (!isActive && result != null)
{
activeServers.Remove(result);
}
}