using System;

using System.Text;

using System.Globalization;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        // String

        String s0 = "Martín Muñoz";

        String s1 = "MartÕn Muñoz";

        String s2 = "Martin Munoz";

        String s3 = "Martin MuÑoz Güido 123";

        //Console.WriteLine("IsUnicode s0: " + IsUnicode(s0));

        //Console.WriteLine("IsUnicode s1: " + IsUnicode(s1));

        //Console.WriteLine("IsUnicode s2: " + IsUnicode(s2));

        Console.WriteLine("decodeValue s0: ");

        decodeValue(s0);

        Console.WriteLine("\ndecodeValue s1: ");

        decodeValue(s1);

        Console.WriteLine("\ndecodeValue s2: ");

        decodeValue(s2);

        Console.WriteLine("\ndecodeValue s3: ");

        decodeValue(s3);

    }

    public static string decodeValue(string text){

        string result = text;

        bool isUnicode = IsUnicode(text);

        if (isUnicode){

            result = decodeStringToISO(text, "ISO");

            bool isUnicode2 = IsUnicode(result);

            if (isUnicode2){

                result = decodeStringToISO(text,"default");

            } else {

                result = text;

            }

        }

        Console.WriteLine("result req: " + text + ", resp: " + result);

        return result;

    }

    public static bool IsUnicode(string input)

    {

        var asciiBytesCount = Encoding.ASCII.GetByteCount(input);

        var unicodBytesCount = Encoding.UTF8.GetByteCount(input);

        //Console.WriteLine("IsUnicode req: " + input + ", resp: " + asciiBytesCount + "<>" + unicodBytesCount);

        return asciiBytesCount != unicodBytesCount;

    }

    public static string decodeStringToISO(string value, string type)

    {

        string decodedString = string.Empty;

        byte[] data = null;

        if (type == "ISO"){

            data = Encoding.GetEncoding("ISO-8859-8").GetBytes(value);

        }

        else {

            data = Encoding.Default.GetBytes(value);

        }

​

        decodedString = Encoding.UTF8.GetString(data);

        Console.WriteLine("decodeStringToISO type " + type + ", req: " + value + ", resp: " + decodedString);

        return decodedString;

    }

}