How can I pass values from IF-statement xaml.cs to cs. In WPF application?

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C#

WPF

buttons

Hello there,
How can I pass values from IF-statement xaml.cs to cs. in WPF Application?

private void Button_Click(object sender, RoutedEventArgs e)
        {
            if ( plus.IsChecked.Value == true && low.IsChecked.Value == true)
            {
                game lvl = new game();
                
                lvl.Show();
                this.Close();
            }

After clicking I would like them to verify all the agreed options and then the value would be sent to class1.
But I don´t know, how I pass the value from IF-statement. I tried it through enum but I'm lost too. Xaml.cs is the main application window In class1 I would just like to take a value so I can then use it in another xaml.cs with name game.cs.

What I have tried:

This is xaml.cs

public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
        
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            game lvl = new game();
                
                lvl.Show();
                this.Close();
            }
            if ( plus.IsChecked.Value == true &&  high.IsChecked.Value == true)
            {
                game lvl = new game();
                
                lvl.Show();
                this.Close();
            }
...

this is cs.:

class Vlastnosti
    {
        public enum Operation
        {
            pluslow, 
            plushigh,
                      

        }
        public static class Class1
        {
           

            static Class1()
            {
                
            }

        }
    }
}

Thank you for advice.