Untitled

using System;
using System.Text;

class MainClass {
    static void Main() {
        string s = "hello world";
        byte[] asciiData = Encoding.ASCII.GetBytes(s);
        byte[] utf8Data = Encoding.UTF8.GetBytes(s);
        string b1 = Convert.ToBase64String(asciiData);
        string b2 = Convert.ToBase64String(utf8Data);
        Console.WriteLine($"\n{b1}\n{b2}");
        s = "嘗試一下吧。當然，寬字元不能用ASCII編碼的。";
        asciiData = Encoding.ASCII.GetBytes(s);
        utf8Data = Encoding.UTF8.GetBytes(s);
        b1 = Convert.ToBase64String(asciiData);
        b2 = Convert.ToBase64String(utf8Data);
        Console.WriteLine($"\n{b1}\n{b2}");
    }
}