根据DataTable 创建 XML

//读Xml至DataTable 

　　 private void butInputXml_Click(object sender, EventArgs e)
        {
            DataSet ds = new System.Data.DataSet();
            ds.ReadXml(this.txtXmlFile.Text);
            DataTable dt = ds.Tables[0];

            this.dataGridView1.DataSource = dt;
        }

//保存Xml

        private void butSaveXml_Click(object sender, EventArgs e)
        {
             DataTable dt = (DataTable)this.dataGridView1.DataSource;
             m_CreateXml(this.txtXmlFile.Text,dt);
        }

//根据DataTable 创建 XML

        private void m_CreateXml(string strXmlFile,DataTable dt)
        {
            System.Xml.XmlTextWriter xmlWriter;
            string strFilename = strXmlFile;
            xmlWriter = new System.Xml.XmlTextWriter(strFilename, Encoding.Default);//创建一个xml文档
            xmlWriter.Formatting = System.Xml.Formatting.Indented;

            xmlWriter.WriteStartDocument();
            xmlWriter.WriteStartElement("handler");

            for (int i = 0; i < dt.Rows.Count-1; i++)
            {
                xmlWriter.WriteStartElement("flow");
                for (int j = 0; j < dt.Columns.Count - 1; j++)
                {
                    xmlWriter.WriteStartElement(dt.Columns[j].Caption);
                    xmlWriter.WriteString(dt.Rows[i][j].ToString());
                    xmlWriter.WriteEndElement();
                }
                xmlWriter.WriteEndElement();
            }

            xmlWriter.WriteEndElement();
            xmlWriter.Close();

        }