Chapter 25. Using Data Validation
IN THIS CHAPTER
An overview of Excel's data validation feature
Practical examples of using data validation formulas
This chapter explores a very useful Excel feature: data validation. Data validation enables you to add dynamic elements to your worksheet without using any macro programming.
25.1. About Data Validation
The Excel data validation feature allows you to set up certain rules that dictate what can be entered into a cell. For example, you may want to limit data entry in a particular cell to whole numbers between 1 and 12. If the user makes an invalid entry, you can display a custom message, such as the one shown in Figure 25.1.
Figure 25.1. Displaying a message when the user makes an invalid entry.
Excel makes it easy to specify the validation criteria, and you can also use a formula for more complex criteria.
25.2. Specifying Validation Criteria
To specify the type of data allowable in a cell or range, follow the steps below while you refer to Figure ...