C# WinApp ต้องการ ตรวจสอบการ เปลี่ยนแปลง data ผ่าน BindingSource หรือไม่ก็ BindingNavigator ครับ

 private void BindingSource_BindingComplete(object sender, BindingCompleteEventArgs e)
        {
            chkSave = true;
        }
bool chkSave = false; //ไว้ตรวจสอบการ แก้ไขข้อมูล
        private void SaveItem_Click(object sender, EventArgs e)
        {
            if (!chkSave) return;
           /* using ( frmWaitFormDialog f = new  frmWaitFormDialog(new Action(() =>
            {*/
                this.Invoke(new Action(() => { this.Validate(); }));
            this.cOMPANYBindingSource.EndEdit();
            company_WebBindingSource.EndEdit();
            company_phoneBindingSource.EndEdit();
            company_FaxBindingSource.EndEdit();
            company_AddressBindingSource.EndEdit();

            this.tableAdapterManager.UpdateAll(this.dS_Company);

            //'dS_Company.Company_Web' 
            this.company_WebTableAdapter.Fill(this.dS_Company.Company_Web);
            //'dS_Company.Company_Email' 
            this.company_EmailTableAdapter.Fill(this.dS_Company.Company_Email);
            //'dS_Company.Company_Fax' 
            this.company_FaxTableAdapter.Fill(this.dS_Company.Company_Fax);
            //'dS_Company.Company_phone' 
            this.company_phoneTableAdapter.Fill(this.dS_Company.Company_phone);
            //'dS_Company.Company_Address' 
            this.company_AddressTableAdapter.Fill(this.dS_Company.Company_Address);
            //'dS_Company.COMPANY' 
            this.cOMPANYTableAdapter.Fill(this.dS_Company.Company_COMPANY);


           /* })))
            {
                f.ShowDialog(this);
            }*/
                 Extension.Extened.ShowMSGSaveDataComplete();


          //  MessageBox.Show("Save Data Complete....");

        }

this.tabControl1.Click += new System.EventHandler(this.SaveItem_Click);