Use data validation rules to control the type of data or the values that users enter into a cell. One example of validation is a drop-down list (also called a drop-down box or drop-down menu). …

You can use data validation to restrict the type of data or values that users enter into cells. This is an advanced topic on data validation. For an introduction to data validation, and how to …

Add data validation. Change a data validation condition. Remove data validation. Ways that users are notified about validation errors. For a form that is designed to be filled out by using …

You can find cells in a workbook that contain data validation by using the Go To Special dialog box. On the Edit menu, point to Find, and then click Go To. Click Special. Select Data …

You can insert a drop-down list of valid entries (also called a drop-down menu or drop-down box) in Excel to make data entry easier, or to limit entries to certain items that you define.

Go to Data > Data Validation. On the Settings tab, click in the Source box, and then on the worksheet that has the entries for your drop-down list, select all of the cells containing those …

You may want to use the data validation tools to check your worksheets for incorrect data that may cause inaccurate calculations or results. Cells that contain invalid data appear with a red …

You can use and refresh connected data in Excel Services. As with any external data source, you may need to authenticate your access. For more information, see Refresh an external data …

You can use the Validation Rule property and the Validation Text property of a form control to validate data that is input to that control and to help users who input data that is not valid.

You can use the following methods to compare data in two Microsoft Excel worksheet columns and find duplicate entries. Method 1: Use a worksheet formula. Start Excel. In a new …