Radio button or option button, is a circular control that comes in a group with other controls of the same type. Usually a radio button like an empty circle or a donut. If it is clicked, it will be filled with a big dot. And in every group of radio button only one can be selected by the user. Example in a membership form, there is always a radio button for Gender for Male and Female.
Visual Basic Code:
'check if the selected radiobutton is male
If RadioButton1.Checked=True Then
'display that the selected radio button is Male