Learn how to create a drop-down list using Data Validation in Excel. Data Validation limits the type of data that can be entered into a cell.

Data validation is one of the most effective ways to protect Web applications from attack. Ensuring only the data you expect is entered into a form or provided via some other input mechanism ...

When you update this spreadsheet with new or different data, you won’t have to re-create the validation rule, but you will need to click Circle Invalid Data again. This tool would be useful to bring ...