string url = Server.MapPath("dingdan")+"\\";//ConfigurationManager.AppSettings["filepath"].ToString();
String fileName = "dingdan"; //DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss");//Guid.NewGuid().ToString();
String path = url + fileName + ".txt";
FileStream fs = new FileStream(path, FileMode.OpenOrCreate);
string body = DateTime.Now.ToString() + (char)13 + (char)10 + "z客户" + Request["name"].ToString() + "的订单内容如下" + (char)13 + (char)10 + ""
+ "性别:" + Request["sex"].ToString() + (char)13 + (char)10 + ""
+ "手机:" + Request["phone"].ToString() + (char)13 + (char)10 + ""
+ "地址:" + Request["addr"].ToString() + (char)13 + (char)10 + ""
+ "产品:" + Request["chanpin"].ToString() + (char)13 + (char)10 + "";
string s = "\n\r" + body + "\n\r";
Byte[] ts = System.Text.Encoding.UTF8.GetBytes(s);
//设定书写的开始位置为文件的末尾
fs.Position = fs.Length;
//将待写入内容追加到文件末尾
fs.Write(ts, 0, ts.Length);
fs.Dispose();
fs.Close();
GC.Collect();