Puzzle game

//http://prntscr.com/8w13bc
//**What I want**
//I'd like it to show a messagebox when for example
//the textboxes have a certain value in it (such as name : tim , fname: dams, etc ..)
//and the right textboxes are checked (for example A, B, Banaan, 3)

//how do i go about this? 


namespace Labo6Extra
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void checkBox1_Checked(object sender, RoutedEventArgs e)
        {

        }

        private void txbName_TextChanged(object sender, TextChangedEventArgs e)
        {
            if (txbName.Text == "Tim")
                
        }
    }
}