private void ClientButton_Click(object sender, RoutedEventArgs e)
        {
            ClientSignUpWindow clientSignUpWindow = new ClientSignUpWindow();

            App.Current.MainWindow.Close();
            App.Current.MainWindow = clientSignUpWindow;
            App.Current.MainWindow.Show();
        }
        private void BackToClient()
        {
            ClientSignUpWindow clientSignUpWindow = new ClientSignUpWindow();

            App.Current.MainWindow.Close();
            App.Current.MainWindow = clientSignUpWindow;
            App.Current.MainWindow.Show();
        }