private void barButtonItem1_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
        {
            XtraForm  form          = Test_Ketnoi(typeof(XtraForm), SubApp.KHACHHANG);
            AddClient formAddClient = new AddClient(kn, branchCode, form, mystack);

            formAddClient.ShowDialog();
            disableKH();
        }
        private void editKHBtn_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
        {
            XtraForm form = Test_Ketnoi(typeof(XtraForm), SubApp.KHACHHANG);

            if (choosedItem != null && form != null)
            {
                AddClient clientForm = new AddClient(kn, choosedItem, form, mystack);
                clientForm.ShowDialog();
            }
            disableKH();
        }