Create an unbound text box to display the result. Set its
Control Source to:
=[TextBox1]+[TextBox2]-[Textbox3]*[TextBox4]
where [TextBox1] etc are the names (look in the Properties
to get this) of the controls on the form holding data you
want to calculate from, and obviously I just used +, - and
* as examples. You know what the expression should be.
