Read a large file and write the processed data into a stream

LargeFileReader.cs

// https://stackoverflow.com/questions/2161895/reading-large-text-files-with-streams-in-c-sharp
// https://docs.microsoft.com/en-us/dotnet/standard/io/how-to-write-text-to-a-file
using (FileStream fs = File.Open(path, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
using (BufferedStream bs = new BufferedStream(fs))
using (StreamReader sr = new StreamReader(bs))
using (StreamWriter outputFile = new StreamWriter(Path.Combine(mydocpath,"WriteLines.txt")))
{
  string line;
  while ((line = sr.ReadLine()) != null)
  {
    outputFile.WriteLine(line);
  }
}