microsoft-office-professional-2010-step-by-step

Defining Valid Sets of Values for Ranges of Cells 363
When you’re ready to hide the data validation circles, click Clear Validation Circles in the
Data Validation list.
Of course, it’s frustrating if you want to enter data into a cell and, when a message box
appears that tells you the data you tried to enter isn’t acceptable, you aren’t given the
rules you need to follow. With Excel, you can create a message that tells the user which
values are expected before the data is entered and then, if the conditions aren’t met,
reiterate the conditions in a custom error message.
You can turn off data validation in a cell by displaying the Settings page of the Data
Validation dialog box and clicking the Clear All button in the lower-left corner of the
dialog box.