Get MP3 from Google Translate special letters

Question

I am using this code:

using System.Net;
function() {
using (WebClient Client = new WebClient())
        {
            Client.DownloadFile("http://translate.google.com/translate_tts?tl=en&q=hello", "a.mp3");
        }
}

Its working fine. Notice please the English language I am downloading. The main problem comes when I'd like to do the same with language using non-latin letter, for example Thai:

using System.Net;
function() {
using (WebClient Client = new WebClient())
        {
            Client.DownloadFile("http://translate.google.com/translate_tts?tl=th&q=สวัสดี", "a.mp3");
        }
}

But this is giving me such a nonsence mp3 without that word sound. How to fix it please?

Notice the main structure of this website:

...translate.google.com/translate_tts?tl=**en**&q=**hello**"

...translate.google.com/translate_tts?tl=**th**&q=**สวัสดี**"

Answer 1

Use HttpUtility.UrlPathEncode("สวัสดี") to encode the Unicode characters.