A string containing the line terminator string for the current System.IO.TextWriter .
The default line terminator string is a carriage return followed by a line feed ("\r\n").
The line terminator string is written to the text stream whenever one of the WriteLine methods is called. In order for text written by the TextWriter to be readable by a System.IO.TextReader, only "\n" or "\r\n" should be used as terminator strings. If NewLine is set to null, the default newline character is used instead.
For a list of common I/O tasks, see Common I/O Tasks.