=MESSAGEBOX("TYPE OF THISFORMSET = " + TYPE("THISFORMSET"))
IF TYPE("THISFORMSET") = "0"	&& in a formset?
	IF THISFORMSET.DataSession = 2	&& private datasession
		oSearchDlog.nCurSessID = THISFORM.DataSessionID
	ENDIF
ELSE	
	IF THISFORM.DataSession = 2	&& private datasession
		oSearchDlog.nCurSessID = THISFORM.DataSessionID
	ENDIF
ENDIF

The diagnostic MESSAGEBOX displays TYPE OF THISFORMSET = O which is expected because the form is in a formset. But program execution proceeds to the ELSE and then gives an error on IF THISFORM.DataSession = 2 because a form in a formset has no .DataSession property. What is wrong here?

The Hacker's Guide and others say that formsets aren't worth using. But this code is in my framework, which ought to work with formsets in case they are used, even if I get rid of the one I have.

Is there a better way to check whether I am in a formset?