using System;

​

public class Program

{

    public static void Main()

    {

        string message = "this\r\nis\ran\nmessage";

        Console.WriteLine(message);

        string line = string.Empty;

        int brcount = 0;

        while ( QueueMessage(ref line, out brcount, message) )

        {

            Console.WriteLine(line);

            message = message.Remove(0, line.Length + brcount);

        }

        Console.WriteLine(line);

    }

    static bool QueueMessage(ref string line, out int brcount, string message)

    {

        // line endings in ASCII :

        //  LF ( \n ) = 0x0A

        //  CR ( \r ) = 0x0D

        //  CR/LF ( \r\n ) = 0x0D0A

        const char LF = (char)0x0A;

        const char CR = (char)0x0D;

        // now check for the line endings

        int idx = message.IndexOf(CR);

        if(idx != -1)

        {

             if(idx + 2 < message.Length && message[idx + 1] == LF)

             {

                 // CR/LF line ending

                 line = message.Substring(0, idx);

                 brcount = 2;

             }

             else

             {

                 // CR line ending

                 line = message.Substring(0, idx);

                 brcount = 1;

             }

             return true;

        }

        else if ( (idx = message.IndexOf(LF) ) != -1 )

        {

            // LF line ending

            line = message.Substring(0, idx);

            brcount = 1;

            return true;

        }

        else

        {

            // no break line signs found.. store message and add signs to it

            line = message;

            brcount = 0;

            return false;

        }

    }

}