生成xml文档两种方法

1、方法1

sb.Append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
                        sb.Append("<Root>");

  Random rad = new Random();
                    int value = rad.Next(1000, 10000);
                    XmlDocument doc = new XmlDocument();
                    doc.LoadXml(sb.ToString());//生成xml文件

                    string year = DateTime.Now.Year.ToString();
                    string month = DateTime.Now.Month.ToString();
                    if (month.Length < 2) { month = "0" + month; }
                    string day = DateTime.Now.Day.ToString();
                    if (day.Length < 2) { day = "0" + day; }
                    string hour = DateTime.Now.Hour.ToString();
                    if (hour.Length < 2) { hour = "0" + hour; }
                    string minute = DateTime.Now.Minute.ToString();
                    if (minute.Length < 2) { minute = "0" + minute; }
                    string second = DateTime.Now.Second.ToString();
                    if (second.Length < 2) { second = "0" + second; }

                    //文件名称：Iv_河北_20121129132421_随机值.xml
                    string name = "Iv_" + dsProvince.Tables[0].Rows[j][0].ToString().Trim() + "_" + year + month + day + hour +minute + second + "_" + value.ToString() + ".xml";
                    doc.Save("D://UnicomInterface/UnicomSend_back/" + name);