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            destFileName = Server.MapPath(".") + "\\"+destFileName;
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            {
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                Response.Clear();
                Response.ClearHeaders();
                Response.Buffer = false;
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                Response.AppendHeader("Content-Length", fi.Length.ToString());
                Response.ContentType = "application/octet-stream";
                Response.WriteFile(destFileName);
                Response.Flush();
                Response.End();
            }
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