XenAdmin.Wizards.PatchingWizard.PatchingWizard_SelectServers.PageLoaded C# (CSharp) Method

        public override void PageLoaded(PageLoadedDirection direction)
        {
            base.PageLoaded(direction);
            try
            {
                label1.Text = IsInAutomaticMode ? Messages.PATCHINGWIZARD_SELECTSERVERPAGE_RUBRIC_AUTOMATED_MODE : Messages.PATCHINGWIZARD_SELECTSERVERPAGE_RUBRIC_DEFAULT;

                // catch selected servers, in order to restore selection after the dataGrid is reloaded
                List<Host> selectedServers = SelectedServers;

                dataGridViewHosts.Rows.Clear();

                if (IsInAutomaticMode)
                {
                    //hides expand column
                    dataGridViewHosts.Columns[0].Visible = false;
                }
                else
                {
                    dataGridViewHosts.Columns[0].Visible = true;
                }

                List<IXenConnection> xenConnections = ConnectionsManager.XenConnectionsCopy;
                xenConnections.Sort();
                foreach (IXenConnection xenConnection in xenConnections)
                {
                    if (IsInAutomaticMode)
                    {
                        if (!xenConnection.IsConnected)
                            continue;

                        var pool = Helpers.GetPoolOfOne(xenConnection);
                        Host master = pool.Connection.Resolve(pool.master);

                        int index = -1;
                        if (Helpers.GetPool(xenConnection) != null) //pools
                        {
                            index = dataGridViewHosts.Rows.Add(new PatchingHostsDataGridViewRow(pool));
                        }
                        else //standalone hosts
                        {
                            index = dataGridViewHosts.Rows.Add(new PatchingHostsDataGridViewRow(master, false));
                        }

                        EnabledRow(master, SelectedUpdateType, index);
                    }
                    else
                    {
                        Pool pool = Helpers.GetPool(xenConnection);
                        bool hasPool = pool != null;
                        if (hasPool)
                        {
                            int index = dataGridViewHosts.Rows.Add(new PatchingHostsDataGridViewRow(pool));
                            Host master = pool.Connection.Resolve(pool.master);
                            EnabledRow(master, SelectedUpdateType, index);
                        }

                        Host[] hosts = xenConnection.Cache.Hosts;
                        Array.Sort(hosts);
                        foreach (Host host in hosts)
                        {
                            int index = dataGridViewHosts.Rows.Add(new PatchingHostsDataGridViewRow(host, hasPool));
                            EnabledRow(host, SelectedUpdateType, index);
                        }
                    }
                }

                // restore server selection
                SelectServers(selectedServers);
            }
            catch (Exception e)
            {
                log.Error(e, e);
                throw;//better throw an exception rather than closing the wizard suddenly and silently
            }
        }