ถามเรื่อง Treeview กับ Listview ค่ะ รบกวนคนรู้ช่วยบอกทีค่ะ

using System;
using System.Data;
using System.Drawing;
using System.IO;
using System.Reflection;
using System.Text;
using System.Windows.Forms;
using System.Xml;
using System.Xml.Serialization;
using System.Collections.Generic;
using ContentforMobileLearning.DataObjects;

namespace ContentforMobileLearning
{
    public partial class CreateContent : Form
    {

        #region Constructor

        public CreateContent()
        {
            InitializeComponent();
            treeView1.Enter += new EventHandler(treeView1_Enter);
            treeView1.Click += new EventHandler(treeView1_Click);
            treeView1.DoubleClick += new EventHandler(treeViwe1_DoubleClick);
            Content();
            Page();
            i++;
            treeView1.ExpandAll();          
        }

        #endregion

        #region -  File  -

        private void newToolStripMenuItem_Click(object sender, EventArgs e)
        {
            
        }

        private void openToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            
        }

        private void closeProjectToolStripMenuItem_Click(object sender, EventArgs e)
        {

        }

        private void saveToolStripMenuItem_Click(object sender, EventArgs e)
        {
            
        }

        private void saveAsToolStripMenuItem_Click(object sender, EventArgs e)
        {
            
        }


        private void exitToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (MessageBox.Show("จบการทำงาน", "Exit", MessageBoxButtons.YesNo) == DialogResult.Yes)
                this.Close();
        }

        #endregion

        #region -  Content Builder  -

        private void addNewPageToolStripMenuItem_Click(object sender, EventArgs e)
        {

        }

        private void deletePageToolStripMenuItem_Click(object sender, EventArgs e)
        {

        }

        private void importMultimediaFileToolStripMenuItem_Click(object sender, EventArgs e)
        {
            var openFile = new OpenFileDialog();
            openFile.Multiselect = true;
            openFile.Filter = "All files|*.*";
            openFile.RestoreDirectory = true;
            if (openFile.ShowDialog() == DialogResult.OK)
            {
                if (openFile.FileNames != null)
                {
                    for (int i = 0; i < openFile.FileNames.Length; i++)
                    {
                        addImage(openFile.FileNames[i]);
                    }
                }
                else
                    addImage(openFile.FileName);
             }

            listView1.View = View.LargeIcon;
            imageList1.ImageSize = new Size(64, 64);
            listView1.LargeImageList = imageList1;  
        }

        private void removeToolStripMenuItem_Click(object sender, EventArgs e)
        {
            listView1.SuspendLayout();
            if (MessageBox.Show("Are you sure you want to remove", "Remove item", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
            {
                foreach (ListViewItem item in listView1.SelectedItems)
                {
                    listView1.Items.Remove(item);
                }
            }
            listView1.ResumeLayout(true);
        }

        private void exportToXMLToolStripMenuItem_Click(object sender, EventArgs e)
        {
            var saveFile = new SaveFileDialog();
            saveFile.FileName = "";
            saveFile.Filter = "XML Files|*.xml|All Files|*.*";
            if (saveFile.ShowDialog() == DialogResult.OK)
            {
                WriteXml write = new WriteXml();
                write.serializeXml(treeView1, saveFile.FileName);
            }
        }

        private void importFromXMLToolStripMenuItem_Click(object sender, EventArgs e)
        {
            var openFile = new OpenFileDialog();
            openFile.FileName = "";
            openFile.Filter = "XML Files|*.xml|All Files|*.*";

            if (openFile.ShowDialog(this) == DialogResult.OK)
            {
                ReadXml read = new ReadXml();
                read.deserializeXml(openFile.FileName, treeView1);
            } 
        }

        #endregion

        #region -  Emulator  -

        private void playContentToolStripMenuItem_Click(object sender, EventArgs e)
        {
            PlayContent f2 = new PlayContent(this);
            f2.ShowDialog();  
        }

        #endregion

        #region -  Help  -

        private void aboutToolStripMenuItem_Click(object sender, EventArgs e)
        {
            About f3 = new About(this);
            f3.ShowDialog();
        }

        #endregion

        #region -  Treeview  -

        private void cmnuAddNode_Click(object sender, EventArgs e)
        {
            Page();
            i++;
            treeView1.ExpandAll();
        }

        private void cmnuRemoveNode_Click(object sender, EventArgs e)
        {
            treeView1.SelectedNode.Remove();
        }

        private void treeViwe1_DoubleClick(object sender, EventArgs e)
        {
            treeView1.LabelEdit = true;
            treeView1.SelectedNode.BeginEdit();
        }

        private void treeView1_Enter(object sender, EventArgs e)
        {
            treeView1.LabelEdit = false;
        }

        private void treeView1_Click(object sender, EventArgs e)
        {
            treeView1.LabelEdit = false;
        }

        public void Content()
        {
            ContentData data = new ContentData();
            treeView1.Nodes.Add(data.Content);
            treeView1.Nodes[0].Nodes.Add(data.ContentInformationt);
            treeView1.Nodes[0].Nodes[0].Nodes.Add(data.ContentName);
            treeView1.Nodes[0].Nodes[0].Nodes[0].Nodes.Add(data.Name);
            treeView1.Nodes[0].Nodes[0].Nodes.Add(data.ContentDescription);
            treeView1.Nodes[0].Nodes[0].Nodes[1].Nodes.Add(data.Description);
            treeView1.Nodes[0].Nodes[0].Nodes.Add(data.ContentAuthor);
            treeView1.Nodes[0].Nodes[0].Nodes[2].Nodes.Add(data.Author);
            treeView1.Nodes[0].Nodes[0].Nodes.Add(data.ContentDate);
            treeView1.Nodes[0].Nodes[0].Nodes[3].Nodes.Add(data.Date);
        }

        int i = 1;

        private void Page()
        {
            ContentPage page = new ContentPage();
            treeView1.Nodes[0].Nodes.Add(page.ContentPages);
            treeView1.Nodes[0].Nodes[i].Nodes.Add(page.ContentSequence);
            treeView1.Nodes[0].Nodes[i].Nodes[0].Nodes.Add("1");
            treeView1.Nodes[0].Nodes[i].Nodes.Add(page.ContentPageType);
            treeView1.Nodes[0].Nodes[i].Nodes[1].Nodes.Add(page.PageType);
            treeView1.Nodes[0].Nodes[i].Nodes.Add(page.ContentPageDescription);
            treeView1.Nodes[0].Nodes[i].Nodes[2].Nodes.Add(page.PageDescription);
            treeView1.Nodes[0].Nodes[i].Nodes.Add(page.ContentVideoFileName);
            treeView1.Nodes[0].Nodes[i].Nodes[3].Nodes.Add(page.VideoFileName);
            treeView1.Nodes[0].Nodes[i].Nodes.Add(page.ContentImageFileName);
            treeView1.Nodes[0].Nodes[i].Nodes[4].Nodes.Add(page.ImageFileName);
            treeView1.Nodes[0].Nodes[i].Nodes.Add(page.ContentSoundeFileName);
            treeView1.Nodes[0].Nodes[i].Nodes[5].Nodes.Add(page.SoundeFileName);
        }

        #endregion

        #region -  Listview  -

        private void delectToolStripMenuItem_Click(object sender, EventArgs e)
        {
            listView1.SuspendLayout();
            if (MessageBox.Show("Are you sure you want to remove", "Remove item", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)
            {
                foreach (ListViewItem item in listView1.SelectedItems)
                {
                    listView1.Items.Remove(item);
                }
            }
            listView1.ResumeLayout(true);
        }

        int baseValue = 0;
        private void addImage(string imageToLoad)
        {
            try
            {
                if (imageToLoad != "")
                {
                    imageList1.Images.Add(Image.FromFile(imageToLoad));
                    listView1.BeginUpdate();
                    listView1.Items.Add(imageToLoad, baseValue++);
                    listView1.EndUpdate();
                }
            }
            catch
            {
                MessageBox.Show("This is not an image file", "Not Image");
            }
        }

        #endregion
    }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ContentforMobileLearning.DataObjects
{
    class ContentData
    {
        private String content = "CONTENT";
        public string Content
        {
            get { return content; }
            set { content = value; }
        }

        private String contentInformationt = "CONTENT_INFORMATION";
        public string ContentInformationt
        {
            get { return contentInformationt; }
            set { contentInformationt = value; }
        }

        private String contentName = "NAME";
        public string ContentName
        {
            get { return contentName; }
            set { contentName = value; }
        }

        private String name = "------";
        public string Name
        {
            get { return name; }
            set { name = value; }
        }

        private String contentDescription = "DESCRIPTION";
        public string ContentDescription
        {
            get { return contentDescription; }
            set { contentDescription = value; }
        }

        private String description = "------";
        public string Description
        {
            get { return description; }
            set { description = value; }
        }

        private String contentAuthor = "AUTHER";
        public string ContentAuthor
        {
            get { return contentAuthor; }
            set { contentAuthor = value; }
        }

        private String author = "------";
        public string Author
        {
            get { return author; }
            set { author = value; }
        }

        private String contentDate = "DATE";
        public string ContentDate
        {
            get { return contentDate; }
            set { contentDate = value; }
        }

        private String date = "------";
        public string Date
        {
            get { return date; }
            set { date = value; }
        }
    }

 }

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ContentforMobileLearning.DataObjects
{
    public class ContentPage
    {
        private String contentPage = "CONTENT_PAGE";
        public string ContentPages
        {
            get { return contentPage; }
            set { contentPage = value; }
        }

        private String contentSequence = "SEQUENE";
        public string ContentSequence
        {
            get { return contentSequence; }
            set { contentSequence = value; }
        }

        /*public int sequence ;
        public int Sequence
        {
            get { return sequence; }
            set { sequence = value; }
        }*/

        private String contentPageType = "PAGR_TYPE";
        public string ContentPageType
        {
            get { return contentPageType; }
            set { contentPageType = value; }
        }

        private String pageType = "------";
        public string PageType
        {
            get { return pageType; }
            set { pageType = value; }
        }

        private String contentPageDescription = "PAGR_DESCRIPTION";
        public string ContentPageDescription
        {
            get { return contentPageDescription; }
            set { contentPageDescription = value; }
        }

        private String pageDescription = "------";
        public string PageDescription
        {
            get { return pageDescription; }
            set { pageDescription = value; }
        }

        private String contentVideoFileName = "VIDEO_FILE_NAME";
        public string ContentVideoFileName
        {
            get { return contentVideoFileName; }
            set { contentVideoFileName = value; }
        }

        private String videoFileName = "*.mp4";
        public string VideoFileName
        {
            get { return videoFileName; }
            set { videoFileName = value; }
        }

        private String contentImageFileName = "IMAGE_FILE_NAME";
        public string ContentImageFileName
        {
            get { return contentImageFileName; }
            set { contentImageFileName = value; }
        }

        private String imageFileName = "*.jpg";
        public string ImageFileName
        {
            get { return imageFileName; }
            set { imageFileName = value; }
        }

        private String contentSoundeFileName = "SOUND_FILE_NAME";
        public string ContentSoundeFileName
        {
            get { return contentSoundeFileName; }
            set { contentSoundeFileName = value; }
        }

        private String soundeFileName = "*.mp3";
        public string SoundeFileName
        {
            get { return soundeFileName; }
            set { soundeFileName = value; }
        }
    }
}