Method or data member not found

I'm pulling my (what little bit I have left) hair out over why this code doesn't work:

Cat1_MINIMUM = Square_Foot / 50.22: Cat1MINIMUM = Fix(Cat1_MINIMUM) ' Hip Hop, Break, Tap and Technical
txt901.Text = Cat1MINIMUM

During debug every "Value" and the string "Cat1MINIMUM" return the correct result - BUT = txt901.Text won't accept it. ("Method or data member not found")

I've pre-coded 30 TextBoxes as txt901 through txt915 and txt801 through txt815. They are suppose to display a COUNT for NUMBER for DANCERS as determined by similar line of code as shown here.

I've been trying to solve this problem for several days - to no avail. Can one of you younger coders please assist me in correcting this problem? --- Thank you