using System;

public class Program

{

    public void Main()

    {

        string  str  =  @"line 1

line 2

line 3";

        Console.WriteLine(Environment.NewLine  ==  "\r\n");

        Console.WriteLine(str.Contains(Environment.NewLine));

        Console.WriteLine(str.Contains("\r"));

        Console.WriteLine(str.Contains("\n"));

    }

}