Getting Problem in Outlook Contact Item Event Handling

Hi,
I am developing Shared Add-in for outlook 2007.
I am handling Add/Edit Event for Outlook contact Item , but getting some problem.
When I am add any contact to Outlook it fires "Add Event" but then after calls "Edit Event" twice.
same as When Edit any Contact it fires "Edit Event" twice.
So I am not getting what this happening . I am going on the wrong direction or this is the fundamental mechanism of outlook events.
Here the code what I have done..
I am trying to solve this problem since last few days ..
So Please help me for same

Regards
Ctal

My Block of Code:


namespace MyAddin1
{
    using System;
    using Extensibility;
    using System.Runtime.InteropServices;
    using Outlook = Microsoft.Office.Interop.Outlook;

    [GuidAttribute("5753D6D1-8F10-4536-8BD7-AA83EC82B78C"), ProgId("TestNexusOutlookAddin.Connect")]
    public class Connect : Object, Extensibility.IDTExtensibility2
    {
        public static Outlook.Application myApplicationObject;
        private Ol.Items ContactItem;
        private Ol.Folder Contactfld = null;
        private Ol.MAPIFolder _ContactFolder;

        public void OnConnection(object application, Extensibility.ext_ConnectMode connectMode, object addInInst, ref System.Array custom)
        {
            try
            {
                // Get the initial Application object
                myApplicationObject = (Ol.Application)application;

                Ol.NameSpace _nameSpace = myApplicationObject.GetNamespace("MAPI");

                #region Contact Item Events

                _ContactFolder = _nameSpace.GetDefaultFolder(Ol.OlDefaultFolders.olFolderContacts);
                ContactItem = (Ol.Items)_ContactFolder.Items;

                ContactItem.ItemAdd += new Ol.ItemsEvents_ItemAddEventHandler(Items_ItemAdd);
                ContactItem.ItemChange += new Ol.ItemsEvents_ItemChangeEventHandler(Items_ItemChange);


                Contactfld = (Ol.Folder)_ContactFolder;
                Contactfld.BeforeItemMove += new Ol.MAPIFolderEvents_12_BeforeItemMoveEventHandler(Items_BeforeItemMove);

                //ContactItemClass.AttachmentAdd += new Ol.ItemEvents_10_AttachmentAddEventHandler(ContactItemClass_AttachmentAdd);

                #endregion

            }
            catch (Exception ex)
            {
                System.Windows.Forms.MessageBox.Show(ex.Message);
            }

            addInInstance = addInInst;

            if (connectMode != Extensibility.ext_ConnectMode.ext_cm_Startup)
            {
                OnStartupComplete(ref custom);
            }
        }

        void Items_ItemAdd(object Item)
        {

        }
        void Items_ItemChange(object Item)
        {
            Outlook._ContactItem NewContact;
            NewContact = (Outlook._ContactItem)Item;


        }
        void Items_BeforeItemMove(object Item, Outlook.MAPIFolder MoveTo, ref bool Cancel)
        {

        }
    }
}