Setting Property's to nothing or null

I'm using forms for data entry, and want to clear each textbox once data has been submitted so old data isn't sitting there next time someone enters data... but i can't get it to clear... i've tried setting each property to null, but it cracks it...

Sample of my code:

Sub ClearData()

With Me
.OperatorBox.Text = Null
.DateBox.Text = Null

etc...

i know i can't use null like this... but i don't know how i should... any help would be ace!

Cheers