I think this is a simple operation but I can not find the way to do it.
I have a excel user form with 3 text boxes, tb1, tb2 and tb3. I want to use
tb3 to show the results of the enteries made in tb1 & 2. For example
tb1 = Maximum
tb2 = Minimum
tb3 = Maximum - Minimum
After the entry is made in tb2 then tb3 will automatically show the
calculated result as the user will not be allowed to move onto that textbox.
At this point the record wil is part of a larger form and not updated to the
worksheet.

Regards