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If the row does not pass validation, set the Cancel Event Args. The validation events are meant to support the data validation of the user input.I'm not sure how you delete them from here though as again they still have not been added to the dataset and it threw an exception in the quick test I did.A better alternative would be to use the Row Validated event if its available as the row at this point has been added to the dataset/datasource.I want my users to enter some data into a bound Data Grid View (dgv) and when done to have the program fill in some columns (hidden key) and to populate some cells in the same row according to the data entered - like max of several cells.Can I use Data Grid View Row Validating to update cells? What would be the correct way for me to fill in hidden key information and to calculate some cell values?The Cell Validating event occurs when a cell is about to commit new content.
No values are changed in the data source before validation.
If the row does not pass validation, set the System.
Use this event to perform validation on all the values of a row.
For more information about handling events, see Consuming Events.
Validated events from occurring, and also prevents the user from leaving the invalid row and prevents the row from being saved to an external data source in data bound mode.
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Now if a row is on edit mode, I must prevent users from leaving the current row.