How to convert a string to RTF in C#?

I found a nice solution that actually uses the RichTextBox itself to do the conversion:

private static string FormatAsRTF(string DirtyText)
{
    System.Windows.Forms.RichTextBox rtf = new System.Windows.Forms.RichTextBox();
    rtf.Text = DirtyText;
    return rtf.Rtf;
}

http://www.baltimoreconsulting.com/blog/development/easily-convert-a-string-to-rtf-in-net/

Doesn't RichTextBox always have the same header/footer? You could just read the content based on off-set location, and continue using it to parse. (I think? please correct me if I'm wrong)

There are libraries available, but I've never had good luck with them personally (though always just found another method before fully exhausting the possibilities). In addition, most of the better ones are usually include a nominal fee.

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EDIT
Kind of a hack, but this should get you through what you need to get through (I hope):

RichTextBox rich = new RichTextBox();
Console.Write(rich.Rtf);

String[] words = { "Européen", "Apple", "Carrot", "Touché", "Résumé", "A Européen eating an apple while writing his Résumé, Touché!" };
foreach (String word in words)
{
    rich.Text = word;
    Int32 offset = rich.Rtf.IndexOf(@"\f0\fs17") + 8;
    Int32 len = rich.Rtf.LastIndexOf(@"\par") - offset;
    Console.WriteLine("{0,-15} : {1}", word, rich.Rtf.Substring(offset, len).Trim());
}

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EDIT 2

The breakdown of the codes RTF control code are as follows:

• Header
  • \f0 - Use the 0-index font (first font in the list, which is typically Microsoft Sans Serif (noted in the font table in the header: {\fonttbl{\f0\fnil\fcharset0 Microsoft Sans Serif;}}))
  • \fs17 - Font formatting, specify the size is 17 (17 being in half-points)
• Footer
  • \par is specifying that it's the end of a paragraph.

Hopefully that clears some things up. ;-)

This is how I went:

private string ConvertString2RTF(string input)
{
    //first take care of special RTF chars
    StringBuilder backslashed = new StringBuilder(input);
    backslashed.Replace(@"\", @"\\");
    backslashed.Replace(@"{", @"\{");
    backslashed.Replace(@"}", @"\}");

    //then convert the string char by char
    StringBuilder sb = new StringBuilder();
    foreach (char character in backslashed.ToString())
    {
        if (character <= 0x7f)
            sb.Append(character);
        else
            sb.Append("\\u" + Convert.ToUInt32(character) + "?");
    }
    return sb.ToString();
}

I think using a RichTextBox is:
1) overkill
2) I don't like RichTextBox after spending days of trying to make it work with an RTF document created in Word.