StreamWriter Truncating Output

Hi folks - my first post here.

I created a console app and use this simple code to read from a text file
(2091 lines) and the writes out to another file:

 string inputfile = "D:/BTCO112.SAMPLE.TXT";
 string outputfile = "D:/BTCO112.OUTPUT.TXT";

 StreamReader sr = new StreamReader(inputfile);
 StreamWriter sw = new StreamWriter(outputfile);
 string line = "";
 while ((line = sr.ReadLine()) != null)
 {
  sw.Write(line + "\r\n");
 }

Everything gets written out fine (identical) until the last 51 rows - they
are missing from the output file.  When I added another 500 lines to the
input file, the output file was 102 lines shorter this time.  Do I need to
clear the StreamWriter buffer out now and then?  Why would it stop writing?

John Halliday

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