Excel's data validation feature is more versatile than you might think. Learn how to use literal values, input values, list values, and even formulas to restrict input date values using data ...

Setting a Custom data validation format and setting the trigger to "~" or any other non-formula evaluated character will give you an error when you enter something in the cell.

Learn how to use a data validation control to allow users to select when to run multiple VBA procedures in Microsoft Excel.

I've got an Excel 97 worksheet in which I need to validate some cells. No problem, I'll just use Data->Validate, right? Wrong. The built in validation works well enough as long as the user doesn't ...

Automated Data Entry in Excel. One way businesses can save time and money is using Excel spreadsheets as data tables in which to store customer information, inventory details or other important data.