BzReader.ProgressDialog.Indexer_ProgressChanged C# (CSharp) Method

        private void Indexer_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            IndexingProgress ip = (IndexingProgress)e.UserState;

            if (!String.IsNullOrEmpty(ip.Message))
            {
                textBox.AppendText(ip.Message + Environment.NewLine);
            }
            if (!String.IsNullOrEmpty(ip.ETA))
            {
                labelETA.Text = String.Format(Properties.Resources.ETA, ip.ETA);
            }

            if (e.ProgressPercentage > 0)
            {
                progressBar.Value = e.ProgressPercentage;
            }

            if (ip.IndexingState == IndexingProgress.State.Failure)
            {
                btnDone.Text = Properties.Resources.CloseIndexingForm;
            }

            if (ip.IndexingState == IndexingProgress.State.Finished)
            {
                indexingRunning = false;

                labelETA.Text = Properties.Resources.IndexingDoneETA;

                DialogResult = btnDone.Enabled ? DialogResult.OK : DialogResult.Abort;

                Close();
            }
        }