Hiding and Storing/caching of Application Specific data in MS Word 2003 documents

using System;
using System.Windows.Forms;
using Microsoft.VisualStudio.Tools.Applications.Runtime;
using Word = Microsoft.Office.Interop.Word;
using Office = Microsoft.Office.Core;
using System.Collections.Specialized;
using System.Threading;
using System.Collections;
using System.IO;
using Microsoft.Office.Core;
using System.Reflection;
using System.Diagnostics;
using Common;

namespace WordAddIn1
{
    public partial class ThisAddIn
    {
        public const int STRINGDATA_DOCUMENTID = 100;
        private const int MAX_TRY = 8;
        private static Mutex threadCountMutex = new Mutex(false);
        private static int threadCount = 0;
 
        Word.Application wb;

        private void ThisAddIn_Startup(object sender, System.EventArgs e)
        {
            wb = this.Application;
            wb.DocumentBeforeSave += new Microsoft.Office.Interop.Word.ApplicationEvents4_DocumentBeforeSaveEventHandler(wb_DocumentBeforeSave);
            wb.DocumentBeforeClose += new Microsoft.Office.Interop.Word.ApplicationEvents4_DocumentBeforeCloseEventHandler(wb_DocumentBeforeClose);
            wb.DocumentOpen += new Microsoft.Office.Interop.Word.ApplicationEvents4_DocumentOpenEventHandler(wb_DocumentOpen);
        }

        void wb_DocumentBeforeSave(Microsoft.Office.Interop.Word.Document Doc, ref bool SaveAsUI, ref bool Cancel)
        {
            if (SaveAsUI)
            {
                string documentID = String.Empty;
                FileOperation fileoperation = new FileOperation();
                Boolean documentIDExists = fileoperation.ReadData(Doc.FullName, STRINGDATA_DOCUMENTID, ref documentID, 256);
                if (documentIDExists == false || documentID == String.Empty || documentID == null)
                {
                    string uniqueID = String.Empty;
                    CustomDocumentPropertyManager docProp = new CustomDocumentPropertyManager();
                    uniqueID = docProp.GetPropertyValue(@"Temp", ref Doc);
                    if (uniqueID != null && uniqueID != String.Empty)
                    {
                        DocumentInfoHandler documentInfohandler = new DocumentInfoHandler();
                        Common.Message docInfo = documentInfohandler.ReadDocumentInfo(uniqueID);
                        if (docInfo != null && docInfo.documentID != null && docInfo.fileName != null && docInfo.documentID != String.Empty && docInfo.fileName != String.Empty)
                        {
                            docInfo.uniqueID = String.Empty;
                            Serialization serializeObj = new Serialization();
                            byte[] requestData = null;
                            bool retVal = serializeObj.Serialize(ref docInfo, ref requestData);
                            if (retVal == true)
                            {
                                ClientApplication Client = new ClientApplication();
                                retVal = Client.StartClient();
                                if (retVal == true)
                                {
                                    try
                                    {
                                        Client.connectDone.WaitOne();
                                        Thread.Sleep(50);
                                        Client.Send(ref requestData);
                                        Client.sendDone.WaitOne();
                                        Client.CloseSocket();
                                    }
                                    catch (Exception ex)
                                    {
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }



        void wb_DocumentOpen(Microsoft.Office.Interop.Word.Document Doc)
        {
       
            string documentID = String.Empty;
            FileOperation fileoperation = new FileOperation();
            Boolean documentIDExists = fileoperation.ReadData(Doc.FullName, STRINGDATA_DOCUMENTID, ref documentID, 256);

            if (documentIDExists && documentID != null && documentID != String.Empty)
            {
                string uniqueFileId = DateTime.Now.Ticks.ToString();
                CustomDocumentPropertyManager docProp = new CustomDocumentPropertyManager();
                bool res = docProp.AddCustomDocumentProperty(@"Temp",uniqueFileId, ref Doc);
                res = docProp.ChangePropertyValue(@"Temp", uniqueFileId, ref Doc);
                if (res == true)
                {
                    DocumentInfoHandler documentInfohandler = new DocumentInfoHandler();
                    Common.Message docInfo = new Common.Message();
                    docInfo.documentID = documentID;
                    docInfo.fileName = Doc.FullName;
                    res=documentInfohandler.WriteDocumentInfo(docInfo, uniqueFileId);
                }
            }
        }

        void wb_DocumentBeforeClose(Microsoft.Office.Interop.Word.Document Doc, ref bool Cancel)
        {
            string uniqueID = String.Empty;
           // MessageBox.Show(Doc.FullName);
            CustomDocumentPropertyManager docPropMgr = new CustomDocumentPropertyManager();
            uniqueID = docPropMgr.GetPropertyValue(@"Temp", ref Doc);
            if (uniqueID != null && uniqueID != String.Empty)
            {
                DocumentInfoHandler documentInfoHandler = new DocumentInfoHandler();

                Common.Message docInfo=documentInfoHandler.ReadDocumentInfo(uniqueID);
               
                if (docInfo != null && docInfo.documentID != null && docInfo.fileName != null && docInfo.documentID != String.Empty && docInfo.fileName != String.Empty)
                {
                    docInfo.fileName = Doc.FullName;
                    Serialization serializeObj = new Serialization();
                    byte[] requestData = null;
                    bool retVal = serializeObj.Serialize(ref docInfo, ref requestData);
                    if (retVal == true)
                    {
                        ClientApplication Client = new ClientApplication();
                        retVal = Client.StartClient();
                        if (retVal == true)
                        {
                            try
                            {
                                Client.connectDone.WaitOne();
                                Thread.Sleep(50);
                                Client.Send(ref requestData);
                                Client.sendDone.WaitOne();
                                Client.CloseSocket();
                            }
                            catch (Exception ex)
                            {
                            }
                        }
                    }
                }
            }
  }

        #region VSTO generated code

        /// <summary>

        /// Required method for Designer support - do not modify

        /// the contents of this method with the code editor.

        /// </summary>

        private void InternalStartup()
        {
            this.Startup += new System.EventHandler(ThisAddIn_Startup);
        }

        #endregion
    }
}