You are not now knowing ctrl is a radio button
you are now knowing because you haven't had an exception, that ctrl has a text property.
Something like
Dim rb as RaidioButton
for each ctrl in Controls
rb = ctrl as RadioButton
if rb Nothing
if rb.Checked
'Dosomething
else
'DoSomethingelse
endif
next
I'm not a vb guy, but the idea is sound.