How to insert the data to the Xml file?

Below is the sample code snippet to insert data to the xml.

protected void InsertRecordToXml_Click(object sender, EventArgs ee)
    {
        XmlDocument docXml = new XmlDocument();
        docXml.Load(Server.MapPath(@"App_Data\TestXmlFile.xml"));
        
        //Create the node to set the data
        XmlElement element = docXml.CreateElement("DotNetFunda");
        XmlElement xmlUser = docXml.CreateElement("UserName");
        XmlElement xmlQuestion = docXml.CreateElement("Question");
        XmlElement xmlSolution = docXml.CreateElement("Solution");

        xmlUser.InnerText = this.txtUser.Text.Trim();
        xmlQuestion.InnerText = this.txtQuestion.Text.Trim();
        xmlSolution.InnerText = this.txtSolution.Text.Trim();


        element.AppendChild(xmlUser);
        element.AppendChild(xmlQuestion);
        element.AppendChild(xmlSolution);

        docXml.DocumentElement.AppendChild(element);

        docXml.Save(Server.MapPath(@"App_Data\TestXmlFile.xml"));

        //call the load method to load the data
        loadUsersXmlData();
    }