StreamWriter add an extra \r in the end of the line

According to MSDN, WriteLine

Writes data followed by a line terminator to the text string or stream.

your last line should be

 _streamWriter.Write(line);

Put it outside of your loop and change your loop so it doesn't manage the last line.

My guess is that the extra \r is added during FTP (maybe try a binary transfer)

Like here

I've tested the code and the extra /r is not due to the code in the current question