Besides examining a radio button's state, you also can set it using the Checked property. The Checked property can take two values, True or False. Here's an example. In this case, we just set a radio button, RadioButton1, to its selected state by setting its Checked property to True:
Private Sub Button1_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles Button1.Click RadioButton1.Checked = True End Sub
And that's all it takes.
How can you make a radio button appear checked when your program first starts? Just set its Checked property to True at design time.