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File.Create(Application.StartupPath + ("\\Setting.config"));
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<?xml version="1.0" encoding="utf-8"?>

---

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FileStream newfile = null;
            if (!File.Exists(Application.StartupPath + "\\Setting.config"))
            {
                newfile = new FileStream(Application.StartupPath + "\\Setting.configt", FileMode.Create, FileAccess.Write);
            }
            else
            { 
                newfile = new FileStream(Application.StartupPath + "\\Setting.config", FileMode.Truncate, FileAccess.Write);
            }
            StreamWriter sw = new StreamWriter(newfile);
            sw.Write(" <?xml version="1.0" encoding="utf-8"?> ");
            sw.Close();
            newfile.Close();