However, pressing the Esc key in this situation will revert the initial value of the cell and it will close the editor.The Row Validating event has a slightly different behavior.This scenario can be achieved by using the Row Validating event, which is fired when the user tries to change the current row (changing to another row or when the control loses focus).
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This Data Grid View exists as part of an entry form with a Cancel button.
In the event that the Cancel button is clicked, I would like to cancel any pending edits to the DGV, reject all changes to its underlying Data Table, etc.
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SOLUTION To achieve data validation prior the row is committed, you can handle the Cell Validating event, which is raised by the control when the current cell changes or when it goes out of edit mode.
Let's assume that the If the user enters empty string for a specific cell and tries to navigate to another row, the validation fails and the Error Text is displayed on the corresponding row.
My problem is that the Row Validating event seems to fire BEFORE my button's click handler is fired, and at all.
I also don't see any way to discern from sender/Event Args that my button click triggered validation, so I'm not sure how to discriminate... I'd already tried the stuff you mentioned in your answer but I was missing this one key setting.
Every now and then cell values of Data Grid View have to be validated.