Conversion from unicode to original format C#

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C#

Unicode

I want to convert from Unicode to its original format UTF8 I think and it could be arabic like below. The user types some unicode text and when he clicks on convert it'll be converted to the original format like below :

string unicode ="\u0633\u0637\u0648\u0631 \u0639\u0628\u0631 \u0627\u0644\u0623\u064a\u0627\u0645 1";

output must equal the original format:

سطور عبر الأيام 1 | شمس الدين خ

i used http://msdn.microsoft.com/en-us/library/vstudio/kdcak6ye%28v=vs.100%29.aspx[^]

as a reference to me but the output is the same like the input nothing happened no conversion has been happened could anyone advice me what's wrong?

What I have tried:

private void btn_convert_Click(object sender, EventArgs e)
        {
            string unicodestring = txt_unicode.Text;
            
            // Create two different encodings.
            Encoding ascii = Encoding.ASCII;
            Encoding unicode = Encoding.Unicode;
            //Encoding Utf8 = Encoding.UTF8;

     // // Convert the string into a byte array.
            byte[] unicodeBytes = unicode.GetBytes(unicodestring);

     // // Perform the conversion from one encoding to the other.
      byte[] ascibytes = Encoding.Convert(unicode,ascii,unicodeBytes);

     // // Convert the new byte[] into a char[] and then into a string.
      char[] asciiChars = new char[ascii.GetCharCount(ascibytes, 0, ascibytes.Length)];
      ascii.GetChars(ascibytes, 0, ascibytes.Length, asciiChars, 0);
     string asciiString = new string(asciiChars);

     // // Display the strings created before and after the conversion.
     //MessageBox.Show("Original string is"+unicodeString);
     MessageBox.Show("Ascii converted string is" + asciiString);
}