C#文字保存为txt文档

 private void C_txt(string str)
    {
        string strname = "D:\\" + System.DateTime.Now.ToString("yyyymmddhhmmss") + ".txt";
        StreamWriter swWordChange = new StreamWriter(strname, false, Encoding.GetEncoding("gb2312"));
        swWordChange.Write(str);
        swWordChange.Close();
    }