AudioFormatConverterUI.m_audioFormatConverterForm.StartConversion C# (CSharp) Method

        private void StartConversion ()
            {
                m_btn_Add.Enabled = false;
                m_btn_Browse.Enabled = false;
                m_btn_Start.Enabled = false;
                m_btnReset.Enabled = false;
                m_btnDelete.Enabled = false;
                m_cb_channel.Enabled = false;
                m_cb_sampleRate.Enabled = false;
            
            IWavFormatConverter audioConverter = new WavFormatConverter ( true );
            int samplingRate = int.Parse ( m_cb_sampleRate.SelectedItem.ToString () );
            int channels = m_cb_channel.SelectedIndex + 1;
            int bitDepth = 16;
            string outputDirectory = m_txt_Browse.Text;
            string convertedFilePath = null;
            bool flag = false;

            if (!Directory.Exists ( outputDirectory )) return;

            int listPositionIndex = 0;


            while (m_lb_addFiles.Items.Count > listPositionIndex && listPositionIndex < 50)
                {
                string filePath = (string)m_lb_addFiles.Items[listPositionIndex];
                //MessageBox.Show ( filePath );
                try
                    {
                    if (Path.GetExtension ( filePath ) == ".wav")
                        {
                        convertedFilePath = audioConverter.ConvertSampleRate ( filePath, outputDirectory, channels, samplingRate, bitDepth );
                        }
                    else if (Path.GetExtension ( filePath ) == ".mp3")
                        {
                        convertedFilePath = audioConverter.UnCompressMp3File ( filePath, outputDirectory, channels, samplingRate, bitDepth );
                        }
                    // rename converted file to appropriate name
                    string newFilePath = Path.Combine ( outputDirectory,
                        Path.GetFileNameWithoutExtension ( filePath ) ) + ".wav";
                    //MessageBox.Show ( newFilePath );
                    if (File.Exists ( newFilePath ))
                        {
                        if (MessageBox.Show ( "File: " + Path.GetFileName ( newFilePath ) + "  already exists. Do you want to overwrite it?", "Warning", MessageBoxButtons.YesNo ) == DialogResult.Yes)
                            {
                            File.Delete ( newFilePath );
                            File.Move ( convertedFilePath, newFilePath );
                            }
                        }
                    else
                        {
                        File.Move ( convertedFilePath, newFilePath );
                        }

                    m_lb_addFiles.Items.RemoveAt ( 0 );
                    }
                catch (System.Exception ex)
                    {
                    flag = true;
                    MessageBox.Show ( ex.ToString () );
                    listPositionIndex++;
                    }
                }

                if (flag == false)
                {
                    MessageBox.Show("Files have been converted");
                }
                else
                    MessageBox.Show("Some files have not been converted properly");

            
            m_btn_Add.Enabled = true;
            m_btn_Start.Enabled = false;
            m_btnDelete.Enabled = false;
            m_btn_Browse.Enabled = true;
            m_btnReset.Enabled = true;
            m_cb_channel.Enabled = true;
            m_cb_sampleRate.Enabled = true;
            }