System.Xml.XmlDocument.WriteContentTo C# (CSharp) Method

        public override void WriteContentTo(XmlWriter xw)
        {
            foreach (XmlNode n in this)
            {
                n.WriteTo(xw);
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            XmlDocument doc = new XmlDocument();
            //To create the XML DOM Tree
            doc.Load(@"D:\MS.Net\CSharp\XMLParser\XMLParser\Emp.xml");

            XmlElement emp = doc.CreateElement("Emp");
            XmlElement eid = doc.CreateElement("EId");
            XmlElement enm = doc.CreateElement("EName");
            XmlElement bs = doc.CreateElement("Basic");
            eid.InnerText = textBox1.Text;
            enm.InnerText = textBox2.Text;
            bs.InnerText = textBox3.Text;
            emp.AppendChild(eid);
            emp.AppendChild(enm);
            emp.AppendChild(bs);
            emp.SetAttribute("Department", textBox4.Text);
            emp.SetAttribute("Designation", textBox5.Text);
            doc.DocumentElement.AppendChild(emp);
            //Writing to file
            XmlTextWriter tr =
                new XmlTextWriter(@"D:\MS.Net\CSharp\XMLParser\XMLParser\Emp.xml", null);
            tr.Formatting = Formatting.Indented;
            doc.WriteContentTo(tr);
            tr.Close();//save the changes
        }