// < Records count = "5" >

//< Record >

// < Contact_ID > 5 - 55W - 55155 </ Contact_ID >

// < Identification_Num > 11111 </ Identification_Num >

// </ Record >

//DataSet ds = new DataSet("Records");

//DataColumn Cw = new DataColumn("Contact_ID", typeof(string));

//DataColumn Cwnum = new DataColumn("Identification_Num", typeof(string));

//DataTable dt = new DataTable(); ;

//for (int i = 0; i <= 20; i++)

//{

// dt = ds.Tables.Add("Record");

// dt.Columns.Add(Cw);

// dt.Columns.Add(Cwnum);

// DataRow dr = dt.NewRow();

// var a = new Random().Next(100200, 99999999);

// var b = new Random().Next(200080, 888999999);

// dr["Contact_ID"] = a + b;

// var c = new Random().Next(100200, 99999999);

// var d = new Random().Next(200080, 888999999);

// dr["Identification_Num"] = c + d;

// dt.Rows.Add(dr);

//}

//dt.WriteXml("aaaaaaaaaaa.xml");

//Console.WriteLine("ok");

//Console.Read();

  string filename = "aaaaaaaa.xml";//创建一个表示所要生成的XML文件路径和文件字称的字符串

                                            // 创建一个写入XML数据的文件流

            System.IO.FileStream myFileStream = new System.IO.FileStream(filename, System.IO.FileMode.Create);

            // 使用文件流对象创建一个XmlTextWriter对象

            System.Xml.XmlTextWriter myXmlWriter = new System.Xml.XmlTextWriter(myFileStream, System.Text.Encoding.Unicode);//如果是UTF-8就得改成这个

            // 指定文件输出的格式

            myXmlWriter.Formatting = System.Xml.Formatting.Indented;

            try

            {

                for (int i = 0; i <= 1000; i++)

                {

                    var a = Guid.NewGuid().ToString().Substring(0,10);

                    var b = Guid.NewGuid().ToString().Substring(0, 10);

                    // 使用WriteXMLbyXmlWriter方法把数据写入XmlTextWriter对象中

                    myXmlWriter.WriteStartElement("Record");

                    myXmlWriter.WriteElementString("Contact_ID", a);

                    myXmlWriter.WriteElementString("Identification_Num", b);

                    myXmlWriter.WriteEndElement();

                }

                // 通过Close方法的调用，XmlTextWriter对象的数据最终写入XML文件

                myXmlWriter.Close();

            }

            catch

            {

            }