How can I pass values from WPF to class?

See more:

C#

XAML

WPF

Hello, how can I pass values from xaml.cs to class? In my MainWindow.xaml.cs I choose two properties and then I want to pass them to the properties.cs.

What I have tried:

MainWIndow.xaml.cs:

else if (deleni.IsChecked.HasValue == true && deleni.IsChecked.Value == true && high.IsChecked.HasValue == true && vhigh.IsChecked.Value == true)
            {
                hra lvl = new hra();
                Deleni del = new Deleni();
                properties prop = new properties(del);
                lvl.Show();
                this.Close();
            }

here I got information that it will be a division with high difficulty

properties.cs:

class properties
    {
        public void deleni(Deleni del)
    }

this is my attempt that leads to nothing


Thank you for any advice!!!