How to insert elements into XML File

using System.Xml;

public partial class index : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

    }

    protected void Button1_Click(object sender, EventArgs e)

    {

        // Open the XML doc

            

        System.Xml.XmlDocument myXmlDocument = new System.Xml.XmlDocument();

        myXmlDocument.Load(Server.MapPath("books.xml"));

        System.Xml.XmlNode myXmlNode = myXmlDocument.DocumentElement.FirstChild;

        // Create new XML element and populate its attributes

        System.Xml.XmlElement myXmlElement = myXmlDocument.CreateElement("entry");

        XmlElement name = myXmlDocument.CreateElement("Name");

        name.InnerText = Server.HtmlEncode(TextBoxName.Text).ToString();

        myXmlElement.AppendChild(name);

        XmlElement location=myXmlDocument.CreateElement("Location");

        location.InnerText=Server.HtmlEncode(TextBoxLocation.Text).ToString();

        myXmlElement.AppendChild(location);

        XmlElement email=myXmlDocument.CreateElement("Email");

        email.InnerText=Server.HtmlEncode(TextBoxEmail.Text).ToString();

        myXmlElement.AppendChild(email);

        XmlElement gender = myXmlDocument.CreateElement("Gender");

        gender.InnerText=Server.HtmlEncode(DropDownListGender.SelectedItem.Text).ToString();

        myXmlElement.AppendChild(gender);

        // Insert data into the XML doc and save

        myXmlDocument.DocumentElement.InsertBefore(myXmlElement, myXmlNode);

        myXmlDocument.Save(Server.MapPath("books.xml"));

        // Re-bind data since the doc has been added to

        BindData();

        LabelMessage.Text = "Record inserted Successfully Inside the XML File...";

        TextBoxName.Text = "";

        TextBoxLocation.Text = "";

        TextBoxEmail.Text = "";

    }

    void BindData()

    {

        XmlTextReader myXmlReader = new XmlTextReader(Server.MapPath("books.xml"));

        myXmlReader.Close();

    }

}