private void Button_Click(object sender, RoutedEventArgs e)
        {
            string NameOfCompany = textbox1.Text;
            string PhoneNumber = textbox2.Text;

            Shipper shipper = new Shipper();
            var shipper1 = new ShipperViewModel(shipper);
            shipper1.CompanyName = NameOfCompany;
            shipper1.Phone = PhoneNumber;

            textbox1.Text = String.Empty;
            textbox2.Text = String.Empty;

            if(shipper1.CompanyName == null || shipper1.CompanyName == "" )
                return;

            MessageBox.Show("You added a shipper");

            NORTHWNDEntities1 entities = new NORTHWNDEntities1();

            entities.Shippers.Add(shipper);
            entities.SaveChanges();
        }