Saving Tree Structure using Serialization

using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.IO;
using System.Windows.Forms;
using ABSTreeSaver;
using ABS.TreeNodeNavigator;
using System.Runtime.Serialization.Formatters.Binary;

namespace HostApp
{
    public partial class frmABSTreeView : Form
    {
        #region USER DEFINED VARIABLES
        private string fileName = "Untitled";
        #endregion
        public frmABSTreeView(string fileName)
        {
            InitializeComponent();

            if (fileName != String.Empty)
            {
                this.fileName = fileName;
                OpenFile();
            }
        }
        private void frmABSTreeView_Load(object sender, EventArgs e)
        {
        }
        #region toolstrip item clicks
        private void toolStripButton1_Click(object sender, EventArgs e)
        {
            frmEditInfo frm = new frmEditInfo();
            frm.ShowDialog();
            if (frm.DialogResult == DialogResult.OK)
            {                
                TreeNode STreeNode = new TreeNode();
                STreeNode.Name = (theTree.Nodes.Count + 1).ToString();
                STreeNode.Tag=frm.TagValue;
                STreeNode.Text = frm.NameValue;
                STreeNode.ImageIndex = 1;
                STreeNode.SelectedImageIndex = 1;
                STreeNode.ToolTipText = "STreeNode Tag Value: "+frm.TagValue.ToString();
                theTree.SelectedNode.Nodes.Add(STreeNode);
                STreeNode.EnsureVisible();
            }
            else
                return;
        }

        private void toolStripButton3_Click(object sender, EventArgs e)
        {
            if (theTree.Nodes.Count != 1)
            {
                if (theTree.SelectedNode != null)
                {
                    theTree.SelectedNode.Remove();
                }
                else
                {
                    MessageBox.Show("Select a STreeNode to remove.", "ABS Treereader", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                }
            }
            else
            {
                MessageBox.Show("This is the last node and cannot be removed.", "ABS Treereader", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }
        }

        private void toolStripButton2_Click(object sender, EventArgs e)
        {
            frmEditInfo frm = new frmEditInfo();
            frm.NameValue = theTree.SelectedNode.Text;
            frm.TagValue = (string)theTree.SelectedNode.Tag;
            frm.ShowDialog();
            if (frm.DialogResult == DialogResult.OK)
            {
                theTree.SelectedNode.Tag = frm.TagValue;
                theTree.SelectedNode.Text = frm.NameValue;
            }
            else
                return;
            
        }

        private void toolStripButton4_Click(object sender, EventArgs e)
        {
            if (fileName == "Untitled")
            {
                saveAsToolStripMenuItem_Click(sender, e);
            }
            else
            {
                SaveFile();
            }
        }

        private void toolStripButton5_Click(object sender, EventArgs e)
        {
            try
            {
                this.theTree.BeginUpdate();
                Navigator trv = new Navigator();
                trv.TreeViewNode = this.theTree.SelectedNode;
                trv.MoveUp();
                this.theTree.EndUpdate();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void toolStripButton6_Click(object sender, EventArgs e)
        {
            try
            {
                this.theTree.BeginUpdate();
                Navigator trv = new Navigator();
                trv.TreeViewNode = this.theTree.SelectedNode;
                trv.MoveLeft();
                this.theTree.EndUpdate();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void toolStripButton7_Click(object sender, EventArgs e)
        {
            try
            {
                this.theTree.BeginUpdate();
                Navigator trv = new Navigator();
                trv.TreeViewNode = this.theTree.SelectedNode;
                trv.MoveRight();
                this.theTree.EndUpdate();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void toolStripButton8_Click(object sender, EventArgs e)
        {
            try
            {
                this.theTree.BeginUpdate();
                Navigator trv = new Navigator();
                trv.TreeViewNode = this.theTree.SelectedNode;
                trv.MoveDown();
                this.theTree.EndUpdate();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
        #endregion
        #region menu item clicks
        private void exitToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.theTree.Nodes.Clear();
            this.theTree.Visible = false;
        }

        private void editNodeToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (theTree.SelectedNode.ImageIndex == 0)
            {
                MessageBox.Show("The root node cannot be edited!", "ABS Treereader", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }
            frmEditInfo frm = new frmEditInfo();
            frm.NameValue = theTree.SelectedNode.Text;
            frm.TagValue = (string)theTree.SelectedNode.Tag;
            frm.ShowDialog();
            if (frm.DialogResult == DialogResult.OK)
            {
                theTree.SelectedNode.Tag = frm.TagValue;
                theTree.SelectedNode.Text = frm.NameValue;
                theTree.SelectedNode.Text = frm.TagValue; 
            }
            else
                return;
        }

        private void deleteNodeToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (theTree.Nodes.Count != 1)
            {
                if (theTree.SelectedNode != null)
                {
                    theTree.SelectedNode.Remove();
                }
                else
                {
                    MessageBox.Show("Select a STreeNode to remove.", "ABS Treereader", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                }
            }
            else
            {
                MessageBox.Show("This is the last node and cannot be removed.", "ABS Treereader", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }
        }
        private void upToolStripMenuItem_Click(object sender, EventArgs e)
        {
            try
            {
                this.theTree.BeginUpdate();
                Navigator trv = new Navigator();
                trv.TreeViewNode = this.theTree.SelectedNode;
                trv.MoveUp();
                this.theTree.EndUpdate();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void leftToolStripMenuItem_Click(object sender, EventArgs e)
        {
            try
            {
                this.theTree.BeginUpdate();
                Navigator trv = new Navigator();
                trv.TreeViewNode = this.theTree.SelectedNode;
                trv.MoveLeft();
                this.theTree.EndUpdate();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void rightToolStripMenuItem_Click(object sender, EventArgs e)
        {
            try
            {
                this.theTree.BeginUpdate();
                Navigator trv = new Navigator();
                trv.TreeViewNode = this.theTree.SelectedNode;
                trv.MoveRight();
                this.theTree.EndUpdate();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        private void downToolStripMenuItem_Click(object sender, EventArgs e)
        {
            try
            {
                this.theTree.BeginUpdate();
                Navigator trv = new Navigator();
                trv.TreeViewNode = this.theTree.SelectedNode;
                trv.MoveDown();
                this.theTree.EndUpdate();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
        private void addNodeToolStripMenuItem_Click(object sender, EventArgs e)
        {
            frmEditInfo frm = new frmEditInfo();
            frm.ShowDialog();
            if (frm.DialogResult == DialogResult.OK)
            {
                TreeNode node = new TreeNode();
                node.Name = (theTree.Nodes.Count + 1).ToString();
                node.Tag = frm.TagValue;
                node.Text = frm.NameValue;
                node.ImageIndex = 1;
                node.SelectedImageIndex = 1;
                node.ToolTipText = "STreeNode Tag Value: " + frm.TagValue.ToString();
                theTree.SelectedNode.Nodes.Add(node);
                node.EnsureVisible();
            }
            else
                return;
        }
        private void newToolStripMenuItem1_Click(object sender, EventArgs e)
        {
            if(theTree.Visible==false)
            {
                theTree.Visible = true;
            }
            fileName = "Untitled";
            theTree.Nodes[0].Nodes.Clear();
            SetFormTitle();
        }
        private void openToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (theTree.Visible == false)
            {
                theTree.Visible = true;
            }
            if (dlgOpenFile.ShowDialog() == DialogResult.OK)
            {
                fileName = dlgOpenFile.FileName;
                OpenFile();
                SetFormTitle();
            }
        }
        private void exitToolStripMenuItem2_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }
        #endregion
        #region 'The saving game'
        private void saveToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (fileName == "Untitled")
            {
                saveAsToolStripMenuItem_Click(sender, e);
            }
            else
            {
                SaveFile();
            }
        }
        private void saveAsToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (dlgSaveFile.ShowDialog() == DialogResult.OK)
            {
                fileName = dlgSaveFile.FileName;

                SaveFile();
                SetFormTitle();
            }
        }
        #endregion
        
        #region Function 'fnOpenFile'
        /// <summary>
        /// This function is responsible for opening the files
        /// </summary>
        protected void OpenFile()
        {
            try
            {
                BinaryFormatter bin = new BinaryFormatter();
                this.theTree.Nodes.Clear();
                FileStream fTree = new FileStream(fileName, FileMode.Open, FileAccess.Read);
                //Fetches the data and stores in the array list
                STreeNode str = (STreeNode)bin.Deserialize(fTree);
                //Closing the file stream
                fTree.Close();
                TreeNode trParent = STROperation.fnPrepareToRead(str);
                foreach (TreeNode trn in trParent.Nodes)
                {
                    this.theTree.Nodes.Add(trn);
                }
            }
            catch (IOException ex)
            {
                MessageBox.Show(ex.Message, "ABS Treereader",
                   MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
            }
        }
        #endregion
        #region function 'SaveFile'
        /// <summary>
        /// This function is responsible for saving files
        /// </summary>
        protected void SaveFile()
        {
            try
            {
                BinaryFormatter bin = new BinaryFormatter();
                STreeNode strToBeGone = STROperation.fnPrepareToWrite(this.theTree);
                //Updating in the file
                FileStream fTree = new FileStream(fileName, FileMode.Create, FileAccess.Write);
                bin.Serialize(fTree, strToBeGone);
                fTree.Close();
            }
            catch (IOException ex)
            {
                MessageBox.Show(ex.Message, "Simple Editor",
                   MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
            }
        }
        #endregion
        
        protected void SetFormTitle()
        {
            FileInfo fileinfo = new FileInfo(fileName);
            this.Text = fileinfo.Name + " - ABS Treereader";
        }

        
        

        
        


    }
}