/// <summary>
        /// Event handler for when an available session menu entry is selected.
        /// </summary>
        void AvailableSessionMenuEntrySelected(object sender, PlayerIndexEventArgs e)
        {
            // Which menu entry was selected?
            AvailableSessionMenuEntry menuEntry        = (AvailableSessionMenuEntry)sender;
            AvailableNetworkSession   availableSession = menuEntry.AvailableSession;

            try
            {
                // Begin an asynchronous join network session operation.
                IAsyncResult asyncResult = NetworkSession.BeginJoin(availableSession,
                                                                    null, null);

                // Activate the network busy screen, which will display
                // an animation until this operation has completed.
                NetworkBusyScreen busyScreen = new NetworkBusyScreen(asyncResult);

                busyScreen.OperationCompleted += JoinSessionOperationCompleted;

                ScreenManager.AddScreen(busyScreen, ControllingPlayer);
            }
            catch (Exception exception)
            {
                NetworkErrorScreen errorScreen = new NetworkErrorScreen(exception);

                ScreenManager.AddScreen(errorScreen, ControllingPlayer);
            }
        }
        /// <summary>
        /// Constructs a menu screen listing the available network sessions.
        /// </summary>
        public JoinSessionScreen(AvailableNetworkSessionCollection availableSessions)
            : base(Resources.JoinSession)
        {
            this.availableSessions = availableSessions;

            foreach (AvailableNetworkSession availableSession in availableSessions)
            {
                // Create menu entries for each available session.
                MenuEntry menuEntry = new AvailableSessionMenuEntry(availableSession);
                menuEntry.Selected += AvailableSessionMenuEntrySelected;
                MenuEntries.Add(menuEntry);

                // Matchmaking can return up to 25 available sessions at a time, but
                // we don't have room to fit that many on the screen. In a perfect
                // world we should make the menu scroll if there are too many, but it
                // is easier to just not bother displaying more than we have room for.
                if (MenuEntries.Count >= MaxSearchResults)
                {
                    break;
                }
            }

            // Add the Back menu entry.
            MenuEntry backMenuEntry = new MenuEntry(Resources.Back);

            backMenuEntry.Selected += BackMenuEntrySelected;
            MenuEntries.Add(backMenuEntry);
        }