/// <summary>
 /// button for add a nanny
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 private void add_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.addNanny(nanny);
         this.Close();
     }
     catch (FormatException)
     {
         MessageBox.Show("cheak your input..");
     }
     catch (Exception ex)
     {
         MessageBox.Show(ex.Message);
     }
 }
 private void addNannyButton_Click(object sender, RoutedEventArgs e)
 {
     try
     {
         bl.addNanny(nny);
         this.Close();
     }
     catch (Exception r)
     {
         MessageBox.Show(r.Message);
     }
 }