/// <summary>
        /// button for update nanny
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void update_nanny_Click(object sender, RoutedEventArgs e)
        {
            if (errorMwsagges.Any())
            {
                string err = "Exaption:";
                foreach (var item in errorMwsagges)
                {
                    err += "\n" + item;
                }
                MessageBox.Show(err);
                return;
            }

            try
            {
                bl.update_details_Nanny(nanny);
                nanny            = new BE.Nanny();
                this.DataContext = nanny;
                this.Close();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }