using System;

using System.Text;

using System.Linq;                  

​

public class Program

{

    public static void Main()

    {

        Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);

        string str = "Привет";

        Console.WriteLine(str);

        Encoding utf8 = Encoding.GetEncoding("Utf-8");

        Encoding windows1251 = Encoding.GetEncoding(1251);

​

        byte[] utf8Byte = utf8.GetBytes(str);

        Console.WriteLine(string.Join(" ", utf8Byte.Select(x => x.ToString("X2"))));

        byte[] windows1251Byte = Encoding.Convert(utf8, windows1251, utf8Byte);

        Console.WriteLine(string.Join(" ", windows1251Byte.Select(x => x.ToString("X2"))));

        str = windows1251.GetString(windows1251Byte);

        Console.WriteLine(str);

        string litva = "A Ą B C Č D E Ę Ė F G H I Į Y J K L M N O P R S Š T U Ų Ū V Z Ž";

        byte[] L_u8 = utf8.GetBytes(litva);

        Console.WriteLine(litva);

        Console.WriteLine(string.Join(" ", L_u8.Select(x => x.ToString("X2"))));

        Encoding windows1257 = Encoding.GetEncoding(1257);

        byte[] L_w1257 = Encoding.Convert(utf8, windows1257, L_u8);

        Console.WriteLine(string.Join(" ", L_w1257.Select(x => x.ToString("X2"))));

        string litva_local = windows1257.GetString(L_w1257);

        string litva_cyr = windows1251.GetString(L_w1257);

        Console.WriteLine(litva_local);

        Console.WriteLine(litva_cyr);

        string privet_1257 = windows1257.GetString(windows1251Byte);

        Console.WriteLine(privet_1257);

    }

}