Get active RadioButton on GroupBox

Question

I've got 12 radiobuttons in GroupBox. I want to get id (or value) of this one, which is currently chosen (active). Is there any built-in C# function to do so and I need to write my own one?

Answer 1

Get Controls into GroupBox and select checked RadioButton:

var radioButton = groupBox.Controls.OfType<RadioButton>().FirstOrDefault(_ => _.IsChecked).