Xml Web Service Turkish Language Problem

Hi, I have a web service and it returns datatables as result of functions. in my database users can define values. and it can contain Turkish characters like i, I.... there is no problem in other turkish characters but i and I are automatically converted to some undefined characters. how can i fix it. i tried to use UTF-8 and iso-8859-9 encoding formats but all can not fix the problem.
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It looks like there is an issue with the 2 turkish characters. Can you able to save it correctly in database? are you using varchar2 as your data-type in DB?
check if this link helps - http://www.dotnet247.com/247reference/msgs/57/286776.aspx

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