using System;

using System.Collections.Generic;

​

public enum LineEnding {

    CRLF,

    CR,

    LF

}

​

public class Program

{

    static Dictionary<LineEnding, string> LineEndingDictionary = new Dictionary<LineEnding, string>

    {

        { LineEnding.CRLF, "\\r\\n" },

        { LineEnding.CR, "\\r" },

        { LineEnding.LF, "\\n" }

    };

    public static void Main()

    {

        string inputString = "CR"; // simulated arg.

        string lineEndingValue;

        try {

            LineEnding lineEnding = (LineEnding)Enum.Parse(typeof(LineEnding), inputString, true);

            lineEndingValue = LineEndingDictionary[lineEnding];

        } catch (ArgumentException ae) {

            throw new Exception( "Unknown or missing line ending for argument 0" );

        }

        Console.WriteLine("Using line ending: " + lineEndingValue);

    }

}