Arabic character goes to ????????

When Encoding a string to utf-8 and convert to that string to PDf using itextsharp arabic letters goes to ????? Whats the reason for this.I tested by giving the response.Charset to utf-8 and other  windows - 1256 etc..... but it didnt works... can anyone know why its not working?????
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May be your PDF reader does not support that Arabic Char ???
When your document is converted into PDF format, perhaps the font that is used by the PDF file does not have the Arabic characters. So instead of showing nothing a default '?' character is used in place.

How are you converting to PDF? Is there an option to embed your font? I use "PDF995" and "Acrobat Distiller" and both of those have an option to embed the font.
Rajesh_mjAuthor Commented:

I am converting the bytes to PDF using the Itextsharp.dll.When i using the uncoding(UTF-*,Windows-1256,Ascii,UTF) the arabic letters goes to ????.But when i use the pdf buffer from the itextsharp all are going fine.The embedded font is helvetica.... Whats the difference between them and what happend when i encoding to UTF-8.......

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Amandeep Singh BhullarCommented:
Have you tried entering the same text in a word processor like "Word Pad" using that font? If you run into the same problem then perhaps you should try the Unicode Arial Font as in my experience this seems to contain a lot of foreign characters.
Rajesh_mjAuthor Commented:

In the wordpad it was working fine,i already installed the corresponding fotn.Ther is no problem.The problem comes only in pdf document.
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