How do I set the visibility of a text box in SSRS using an expression?

Question

I have a subtotal field for a calculated column that I want to hide when my report has not ran yet because on days with no data it shows up as NaN on the report

Answer 1

This didn't work

=IIf((CountRows("ScannerStatisticsData") = 0),False,True)

but this did and I can't really explain why

=IIf((CountRows("ScannerStatisticsData") < 1),False,True)

guess SSRS doesn't like equal comparisons as much as less than.