using System;

​

object button = new RadioButton { Checked = true };

bool result = button switch

{

    RadioButton radioButton => radioButton.Checked,

    CheckButton checkButton => checkButton.Checked,

    _ => throw new NullReferenceException()

};

​

Console.WriteLine(result);

class RadioButton

{

    public bool Checked { get; set; }

}

​

class CheckButton

{

    public bool Checked { get; set; }

}