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By Ken Withee Column validation options allow you to define additional limits and constraints for your data.
For example, you may want to ensure that a value in one Date column occurs after another Date column.
To access this feature, click the Data tab and then click the Data Validation drop-down in the Data Tools group.
The Allow option offers several validation options (which are self-explanatory).
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To copy the code in this topic as a single listing, see How to: Handle Errors That Occur During Data Entry in the Windows Forms Data Grid View Control.
Using Excel's Data Validation feature, you can eliminate inappropriate data.I've read something about Validating Events, but I am not sure how can I use them. Validating Event When you change the focus by using the keyboard (TAB, SHIFT TAB, and so on), by calling the Select or Select Next Control methods, or by setting the Container Control.Active Control property to the current form, focus events occur in the following order Enter Got Focus Leave Validating Validated Lost Focus When you change the focus by using the mouse or by calling the Focus method, focus events occur in the following order: Enter Got Focus Lost Focus Leave Validating Validated event provides the hook to perform the validation and Error Provider gives a nice consistent approach to providing the user with feedback on any error conditions.Usually, you can fix these types of errors — if you catch them.But the most practical thing you can do is to avoid them altogether.