Radio button checked changed event fires twice

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As the other answerers rightly say, the event is fired twice because whenever one RadioButton within a group is checked another will be unchecked – therefore the checked changed event will fire twice.

To only do any work within this event for the RadioButton which has just been selected you can look at the sender object, doing something like this:

void radioButtons_CheckedChanged(object sender, EventArgs e)
{
    RadioButton rb = sender as RadioButton;
    if (rb != null)
    {
        if (rb.Checked)
        {
            // Only one radio button will be checked
            Console.WriteLine("Changed: " + rb.Name);
        }
    }
}

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