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export grid view to excel encoding problem

i am exporting grid view into excel
but i am having problem in encoding
arabic characters are not displayed properly

public void ExportGridViewToExcel(HttpResponse Response, GridView GridView_Excel)
    {
        string attachment = "attachment; filename=Transactions.xls";

        Response.ClearContent();

        HttpContext.Current.Response.ContentEncoding = Encoding.GetEncoding("utf-8");
        HttpContext.Current.Response.Charset = "utf-8";

        Response.AddHeader("content-disposition", attachment);

        Response.ContentType = "application/ms-excel";

        StringWriter sw = new StringWriter();

        HtmlTextWriter htw = new HtmlTextWriter(sw);

        GridView_Excel.RenderControl(htw);

        Response.Write(sw.ToString());

        Response.End();

    }

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any help ??? !!!!!!

public void ExportGridViewToExcel(HttpResponse Response, GridView GridView_Excel)
    {
        string attachment = "attachment; filename=Transactions.xls";

        Response.ClearContent();

        HttpContext.Current.Response.ContentEncoding = Encoding.GetEncoding("utf-8");
        HttpContext.Current.Response.Charset = "utf-8";

        Response.AddHeader("content-disposition", attachment);

        Response.ContentType = "application/ms-excel";

        StringWriter sw = new StringWriter();

        HtmlTextWriter htw = new HtmlTextWriter(sw);

        GridView_Excel.RenderControl(htw);

        Response.Write(sw.ToString());

        Response.End();

    }

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