C#写入文本txt

string now = DateTime.Now.Date.ToShortDateString();
                string todayfile = "D:\\" + now + ".txt";
                StreamWriter sw = new StreamWriter(todayfile, true, Encoding.GetEncoding("gb2312"));
                string ifo = DateTime.Now.ToString() + i + "\r\n";
                ifo += "错误发生时候的sql";
                sw.WriteLine(ifo);
                sw.Close();

 转自：http://benyer1988.blog.163.com/blog/static/1337308892011221105933584/