DSPUtil.WaveReader.OpenFile C# (CSharp) Method

        private void OpenFile(string fileName)
        {
            _filename = fileName;
            if (fileName == null || fileName=="-")
            {
                // use stdin
                //fs = null;
                //bs = null;
                //              Trace.WriteLine("Read stdin");
                Stream stdin = System.Console.OpenStandardInput();
                bs = new BufferedStream(stdin);
                _rdr = new BinaryReader(bs);
            }
            else if (File.Exists(fileName))
            {
                //              Trace.WriteLine("Read {0}", fileName);
                fs = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read, 65536, true);
                bs = new BufferedStream(fs);
                _rdr = new BinaryReader(bs);
            }
            else
            {
                throw (new FileNotFoundException("File " + fileName + " not found"));
            }
        }