using System;

public class Program

{

    public static void Main()

    {

        var bytes = GetBytes("no@spam.comaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa");

​

        Console.WriteLine(string.Join("", bytes));

        Console.WriteLine(GetString(bytes));

    }

    static byte[] GetBytes(string str)

    {

        byte[] bytes = new byte[str.Length * sizeof(char)];

        System.Buffer.BlockCopy(str.ToCharArray(), 0, bytes, 0, bytes.Length);

        return bytes;

    }

    static string GetString(byte[] bytes)

    {

        char[] chars = new char[bytes.Length / sizeof(char)];

        System.Buffer.BlockCopy(bytes, 0, chars, 0, bytes.Length);

        return new string(chars);

    }

}