XenAdmin.Wizards.PatchingWizard.PatchingWizard_PrecheckPage.worker_DoWork C# (CSharp) Method

        private void worker_DoWork(object sender, DoWorkEventArgs e)
        {
            lock (_lock)
            {
                Program.Invoke(this, () =>
                                         {
                                             dataGridView1.Rows.Clear();
                                             progressBar1.Value = 0;
                                             labelProgress.Text = Messages.PATCHING_WIZARD_RUNNING_PRECHECKS;
                                         });
                Pool_patch patch = e.Argument as Pool_patch;
                Pool_update update = e.Argument as Pool_update;

                LivePatchCodesByHost = new Dictionary<string, livepatch_status>();

                List<KeyValuePair<string, List<Check>>> checks = update != null ? GenerateChecks(update) : GenerateChecks(patch); //patch is expected to be null for RPU
                _numberChecks = checks.Count;
                for (int i = 0; i < checks.Count; i++)
                {
                    if (_worker.CancellationPending)
                    {
                        e.Cancel = true;
                        return;
                    }

                    List<Check> checkGroup = checks[i].Value;
                    PreCheckHeaderRow headerRow =
                        new PreCheckHeaderRow(string.Format(Messages.PATCHING_WIZARD_PRECHECK_STATUS, checks[i].Key));
                    _worker.ReportProgress(5, headerRow);

                    PreCheckResult precheckResult = PreCheckResult.OK;
                    for (int j = 0; j < checkGroup.Count; j++)
                    {
                        if (_worker.CancellationPending)
                        {
                            e.Cancel = true;
                            return;
                        }

                        Check check = checkGroup[j];
                        foreach (PreCheckHostRow row in ExecuteCheck(check))
                        {
                            if (precheckResult != PreCheckResult.Failed && row.Problem != null)
                                precheckResult = row.PrecheckResult;
                            _worker.ReportProgress(PercentageSelectedServers(j + 1), row);
                        }
                    }

                    lock (_update_grid_lock)
                    {
                        headerRow.UpdateDescription(precheckResult);
                    }
                }
            }
        }