private void AddLine(object sender, RoutedEventArgs e)
        {
            var newWin = new AddLineAndPackageView(SessionUserId, Customer.UserId, this);

            newWin.Show();
            this.Hide();
        }
        private void Next(object sender, RoutedEventArgs e)
        {
            #region
            string fName    = tbxFirstName.Text;
            string lName    = tbxLastName.Text;
            string password = tbxPassword.Text;
            string phone    = tbxPhoneNumber.Text;
            string address  = tbxAddress.Text;
            string email    = tbxEmailAddress.Text;
            #endregion

            if (ViewModel.ValidateInput(fName, lName, password, phone, address, email))
            {
                //Customer = new CustomerModel
                //{
                //    FirstName = tbxFirstName.Text,
                //    LastName = tbxLastName.Text,
                //    PhoneNumber = tbxPhoneNumber.Text,
                //    Password = tbxPassword.Text,
                //    Address = tbxAddress.Text,
                //    EmailAddress = tbxEmailAddress.Text,
                //    IsActive = true
                //};

                var result = ViewModel.AddCustomer(fName, lName, password, phone, address, email);
                if (result.IsCreated)
                {
                    var nextPage = new AddLineAndPackageView(SessionUserId, result.Id, PreviousWindow);
                    nextPage.Show();
                    this.Close();
                }
                else
                {
                    MessageBox.Show(result.Description);
                }
            }
            else
            {
                ShowErrorMessages();
            }
        }