public void AddClient(Client client)
 {
     lock (_clients)
     {
         _clients.Add(client);
     }
 }
 private void listenSocket_DidAccept(AsyncSocket sender, AsyncSocket newSocket)
 {
     Client client = new Client(newSocket);
     Clients.Instance.AddClient(client);
 }
 public void RemoveClient(Client client)
 {
     lock (_clients)
     {
         _clients.Remove(client);
     }
 }