Saving Values in XML and Retrieving Them

As I saw So many new developers are asking similar question so thought of writing this blog.
  

So to made it bit user friendly, I put 3 text box, where you can enter the values and by clicking "Save value in XML" button, you can save the values in XML format. Currently I am using @"C:\xmlfile.xml" for file path, so you can modify this as per your requirement. I have also added 1 list view and 1 list box, where you can get the values from XML by clicking "RetrieveItems" button. 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using System.Xml;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        private const string FilePath = @"C:\xmlfile.xml";

        public Form1()
        {
            InitializeComponent();
        }

        /// <summary>
        /// Save Values in XML
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnSaveValuesInXML_Click(object sender, EventArgs e)
        {
            // Creates an instance of the System.Xml.XmlTextWriter class using the specified file.
            var textWriter = new XmlTextWriter(FilePath, null);
            // Writes the XML declaration with the version "1.0".
            textWriter.WriteStartDocument();
            // Write comments
            textWriter.WriteComment("First Comment for XmlTextWriter Sample Example");
            // Write first element
            textWriter.WriteStartElement("Student");
            // textWriter.WriteStartElement("Document", "Test", "RECORD");
            // Write next element Name
            textWriter.WriteStartElement("Name");
            textWriter.WriteString(textBox1.Text);
            textWriter.WriteEndElement();
            // Write element Address
            textWriter.WriteStartElement("Address");
            textWriter.WriteString(textBox2.Text);
            textWriter.WriteEndElement();
            // Write element Pincode
            textWriter.WriteStartElement("Pincode");
            textWriter.WriteString(textBox3.Text);
            textWriter.WriteEndElement();
            // Ends the document.
            textWriter.WriteEndDocument();
            // close writer
            textWriter.Close();
            MessageBox.Show(@"Values got stored in XML");
        }

        /// <summary>
        /// Retrieve Items
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnRetrieveItems_Click(object sender, EventArgs e)
        {
            var doc = new XmlDocument();
            doc.Load(FilePath);

            var nodeNames = new List<string>();
            var xmlNodeList = doc.SelectNodes("/Student");

            // Normal Foreach Statement.
            //if (xmlNodeList != null)
            //    foreach (System.Xml.XmlNode node in xmlNodeList)
            //    {
            //        foreach (System.Xml.XmlNode child in node.ChildNodes)
            //        {
            //            nodeNames.Add(child.InnerText);
            //        }
            //    }

            // Linq Statement
            if (xmlNodeList != null)
                nodeNames.AddRange(from XmlNode node in xmlNodeList
                    from XmlNode child in node.ChildNodes
                    select child.InnerText);

            foreach (var node in nodeNames)
            {
                listView1.Items.Add(node); // You can add SubItems for this also.
                listBox1.Items.Add(node);
            }

        }
    }
}