ASP.NET GridView non-English character problem

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ASP.NET

In my page, I show Turkish characters, but it is a problem in the GridView, but not in any othe controls. I traced my code in Debug mode to see when a Turkish character is displayed. I select my data from the database, but at that time, everything is fine. When I step through these lines:

gridview.DataSoruce = dt;
gridview.DataBind();

I look at gridview.Rows's data, and I see Turkish characters messed up.

But the browser grid's data is seen correctly. When posting the page, I cannot read the correct word in the code-behind?

Can anybody help me ?

Note: I tried:

<globalization requestEncoding="utf-8" responseEncoding="utf-8"/>
    <!--<globalization
            fileEncoding="ISO-8859-9"
            requestEncoding="ISO-8859-9"
            responseEncoding="ISO-8859-9"
            culture="tr-TR"
            uiCulture="tr-TR" />-->

But it doesn't work.

I wat go give detail info.
the character I have troube is 'Ç'
and it is ascii value : 199
at browser I see 'Ç' at gridview's column but when I look view source of browser I see

'Ç'

--> Html number of ascii value is 199.
and when I post the page I read

'Ç'

instead of Ç .