private void Button_Click(object sender, RoutedEventArgs e)
        {
            Database Sql = new Database();

            if (Sql.getUserData(BoxLogin.Text, BoxPassword.Password) == null)
            {
                LabelError.Visibility = Visibility.Visible;
            }
            else
            {
                string[]  loggedUser = Sql.getUserData(BoxLogin.Text, BoxPassword.Password);
                UserPanel w2         = new UserPanel(loggedUser);
                w2.Show();
                this.Close();
            }
        }