TsRemux.TsRemux.RemuxButton_Click C# (CSharp) Method

        private void RemuxButton_Click(object sender, EventArgs e)
        {
            if(0 == pidsToKeep.Count)
            {
                MessageBox.Show(
                    this,
                    "No single stream to keep selected !",
                    "Error",
                    MessageBoxButtons.OK,
                    MessageBoxIcon.Error);
                return;
            }

            if (backgroundWorker1.IsBusy == false && backgroundWorker2.IsBusy == false)
            {
                SendMPlayerCmd("frame_step");

                RemuxButton.Text = "Cancel";
                InputFileBrowseButton.Enabled = false;
                OutputFileBrowseButton.Enabled = false;
                InputFileTextBox.Enabled = false;
                OutputFileTextBox.Enabled = false;
                this.Cursor = Cursors.WaitCursor;
                RemuxProgressTimeTextBox.Text = length.Subtract(TrimEnd).ToString();
                RemuxProgressBar.Value = RemuxProgressBar.Minimum;
                RemuxProgressBar.Maximum = (int)length.Subtract(TrimEnd).TotalMinutes;
                FormatBox.Enabled = false;
                TsFormatRadioButton.Enabled = false;
                M2tsFormatRadioButton.Enabled = false;
                BluRayFormatRadioButton.Enabled = false;
                MKVFormatRadioButton.Enabled = false;
                DemuxFormatRadioButton.Enabled = false;
                Quit.Enabled = false;
                cbxUseAsyncIO.Enabled = false;
                cbxBypassAudioProcessing.Enabled = false;
                cbxMlpToAc3.Enabled = false;
                ElementaryStreamsListBox.Enabled = false;
                DisableNumerics();
                whenStarted = DateTime.Now;
                backgroundWorker1.RunWorkerAsync();
            }
            else if (backgroundWorker1.IsBusy)
            {
                RemuxButton.Enabled = false;
                backgroundWorker1.CancelAsync();
            }
            else if (backgroundWorker2.IsBusy)
            {
                RemuxButton.Enabled = false;
                backgroundWorker2.CancelAsync();
            }
        }