private void button3_Click(object sender, EventArgs e) { UserPassDateSetCLS dataset = new UserPassDateSetCLS(); StreamReader keyReader = new StreamReader(keyFileName); string keyXmlStr = keyReader.ReadToEnd(); string EncyptKeyStr = EDncpytString(keyXmlStr, true); FileStream fs = new FileStream(keyFileName + "E", FileMode.Create); StreamWriter sw = new StreamWriter(fs); sw.Write("test"); sw.Flush(); sw.Close(); fs.Close(); //dataset.ReadXml(keyReader); }