using System;

public class Program

{

    public static void Main()

    {

        System.Text.Encoding iso_8859_1 = System.Text.Encoding.GetEncoding("iso-8859-1");

        // Unicode string.

        string s_unicode = "abc€abc";

        byte[] isoBytes =  iso_8859_1.GetBytes(s_unicode);

        var result = iso_8859_1.GetString(isoBytes, 0, isoBytes.Length) == s_unicode;

        Console.WriteLine("result = " + result);

    }

}